There are several things that are being overlooked in this battle I feel, or are being blown out of proportion or not given enough context. The main things I am having issue with is the degree of amp that Mordred's Mana Burst gives her and the potency of her Instinct. My issues are as follows:
1. Mordred is not at all comparable to Artoria when it comes to Instinct. I can't recall a single feat or statement that implies she is, nor that she has any particular future seeing ability. The arguments that because she blocked a single arrow from Chiron meaning that she has future sight or something are strange to me, as there is no reason that should be the case on arrows that he has already launched and can't control. Unless it's stated specifically that Chiron shot that arrow and the future he saw was Mordred not blocking it, I don't see how that feat contributes to the conversation.
Furthermore, the belief that Mordred was equal to Artoria is strange since to my knowledge we never got a full battle between them, and the most we saw was Mordred striking out after already basically dying in one hit. Beyond even that, attempting to bring up Artoria blocking Gae Bolg is absolutely ridiculous, considering the difference in stats between her and Artoria, which is something that I feel is being intentionally ignored.
Artoria has Rank B Luck when Shirou is her master, compared to Mordred having Rank D luck. Luck in Fate seems to be an actually quantifiable fate deciding thing, and Artoria's luck directly contributed to her blocking the Gae Bolg. In fact, Artoria didn't even fully block the Gae Bolg, she was still wounded and just avoided the instant death part of it. It was a combination of her luck, which is higher than Mordred's, and her Instinct A, which is higher than Mordred's and can actually see the future. Attempting to say Mordred can replicate that feat, despite having worse versions of the two things that allowed Artoria to accomplish that feat, is a gross overestimation of her skills. Essentially, there is absolutely no way to scale her Instinct to Artoria's Instinct or to Chiron's Clairvoyance + Minds Eye. Therefore, we should go off her feats alone, which seems to simply be giving her vague senses of danger and lowering visibility penalties, both of which Deku's own Precog does, if not to a higher degree because it is permanently active and further amplified by his own intelligence and prediction skills/feats.
2. The Mana Burst arguments seem especially strange to me. From what I'm gathering, there is no definitive multiplier for Mana Burst, and it just operates as a burst of power, speed or defense. It is for this reason people, for some reason, believe it completely nullifies Deku's precog or his 3x stat advantage, despite nothing implying either. I've yet to see any actual examples of Mordred's Mana Burst in action, and it seems like it's main usage is just letting her use mini versions of her full power Clarent.
Sudden bursts of speed that are predicted with precognition, and performing them against a character like Deku that can avoid attacks from people faster than him by reading their movements, on top of the only way for her to get hits on him is to reach his height since he's flying, doesn't sound like such an advantage to me. This is compounded by the fact that she doesn't seem to be able to use Instinct offensively and predict where he's going to move at any point in time, despite my opposition saying she can, but with no evidence supporting it. Anytime she uses a Mana Burst, what stops Deku from dodging her since he has permanently active defensive precognition?
Mana Burst is not going to let her one shot Deku either. He is 3x her in durability, and has a pain tolerance so high that nothing short of instantaneous death would make him unable to defend himself, similar to Mordred's own Battle Continuation. I don't know why Mickey is acting like Deku's durability isn't also 6.3 megatons, nor that he has several ways of just not getting hurt in the first place, but I feel the stat disadvantage Mordred is at should be recognized further, not just disregarded cause she can unquantifiably amp herself. Unless there is some form of evidence that contradicts what I'm understanding, Mana Burst shouldn't be any issue for Deku's precog skills, and even if she does land hits, they won't be one shotting Deku unless they instantly kill him, which is very doubtful because precog.
3. Deku's versatility and intelligence is being horrendously downplayed. For example, how does Mordred avoid Blackwhip? As I've laid out, her Instinct is not on the level of seeing the future, and at best gives her senses of danger from an opponent while letting her fight with her vision obscured. How does any of that translate to her being able to avoid Deku constantly grabbing at her with Blackwhip, which he can control? Anytime she gets near him and tries to attack, he can simply dodge and grab her or Clarent, with a lifting strength she cannot overcome.
Another facet is his flight, which no one has yet to tell me how she handles other than using her noble phantasm, which he would predict. I feel like people are somehow forgetting Deku has higher ranger than Mordred here? The second he senses danger from her helmet coming off, he’s already capable of backing far away from Mordred and predicting her swinging her sword before she does it.
Also, is everyone ignoring the fact that Deku has ranged attacks as well? And that are more spammable than Mordred's Clarent? He can snipe her from the same distance as her max range Noble Phantasm, and might even do so to interrupt her anytime she attempts to use it since he'll sense when she's doing it before she does it. He doesn't even need to be far away either, if he's closer to Mordred, he can toss her all around with the air pressure of his attacks while keeping up his attempts to bind her with Blackwhip.
She can't block his direct attacks, because then he'll bind her sword with Blackwhip. She can't use her Noble Phantasm reliably, because he can sense when she's going to do it and can either fly far enough that avoiding it is easy or interrupt her with air pressure or Blackwhip. Her instinct is purely defensive, and she has no feats that suggest she can keep up with Deku's own analytical prediction when he tries to grapple her. Her mana burst is an unquantifiable amp, and therefore should not be banked on to be able to one shot Deku or speed blitz him unless there are feats for it that I am missing.
Every tool that has been brought up for Mordred is one that I have addressed or raised an argument against. If I am missing anything, I will be glad to hear my oppositions thoughts on the matter. From what I can see, Deku just eternally dodges with his precog and flight before eventually catching Mordred with Blackwhip because her Instinct doesn't have the feats to suggest she can avoid them forever.