As much as I don't agree with the match concept as a whole I'm just going to look this over.
high reward out of high risk manoeuvres to near perfection
I mean to be fair Mac also does this. A lot of the opportune ways to get stars in the punch out games involve standing in the way of a big hurt attack. It's a high reward out of a high risk situation, that needs perfect timing. Whether it's getting bull rushed or punching someone who can literally create afterimages.
but very few if any have the sheer versatility
While no one fighter in the game has had a lot of versatility, he's still faced many versatile opponents to the point where I don't think a lot is going to surprise Lil' Mac. He's gone up against shit that would make a real life boxer or wrestler leave the ring lol.
it’s still boxing to an extent
Tbh I'd argue that a good chunk of the shit Mac deals with just straight up isn't boxing lol.
Bear Huggers overhead smash with his fists, Bald Bull literally just charging at people, Bob Charlie dancing in the ring (wtf lol),
Dragon Chan literally kicking him in the face, via jumping off the ropes and dancing around like he's in a martial arts movie (woo racism), masked muscle spitting in his eyes, literally ******* everything that Aran Ryan does like good lord, someone using their hair as a weapon, someone juggling balls in the arena, someone who
just isn't boxing (open palm strikes, kicks, backhands, literally brings a weapon to the ring, etc). Idk if it still qualifies as boxing in some of these matches but it's sure uh, something.
climbs up the top rope to finish him with a coup de grâce
Isn't this like, really similar to Dragon Chan jumping off the ropes. Either way climbing up the ropes takes at least a bit, I don't see why Mac can't recover.
he doesn’t know what to do if Bálor puts him in a hold
I'm pretty sure there are some opponents that try to grapple Mac.
or exits the ring and pulls a steel chair out from under it
Mac has dealt with people who brought weapons into the ring before. Long ranged weapons at that if you include Aran. Also I feel like it needs to be specified in the OP that there's a chair under the ring lol. I think frankly putting them in a wrestling ring is a bit too advantageous for the pro wrestler in all these scenarios. Put these guys in like central park where it's more even ground and half the stuff mentioned falls apart.
Overall I'm not super convinced by the arguments as I think it ignores a lot of Mac's experience with unpredictable and tricky opponents that Finn, I feel, just can't contend with.