Speed aside, there's also a vague statement that probably makes sense now. Raiden states that immortals exist outside the normal laws of time, in response to the time merger summoning his past self which erased his present self. This used to be pretty vague, but Shinnok's example might explain this.
When Dark Raiden beheaded Shinnok, the act itself was stated to be irreversible by Kronika (further backed up by the writer himself). What this means in practice is that rewinding time on Shinnok or Cetrion if they happen to be destroyed will not restore them to their previous state. For example, when the Netherrealm temple was restored after the Special Forces blew it up, the head of Shinnok remained intact even in the destruction and appears later on in Aftermath but still as a head. He was likely affected by Kronika's time rewind on the temple since he was put back in his place in the cathedral, but even the rewind didn't restore him back to his body. So the only solution would be to rewind the entire timeline with the Hourglass, which seems to
happen instantly once the Hourglass is used (unlike Kronika's own time powers which looks like
this)
So what does this mean? Pretty much every other god that's just like Raiden or anyone above him (as long as they're immortal) will have some form of resistance to time manipulation. Example, stuff like rewinding time on Shinnok to put him back in his previous location will work, but manipulating time on Shinnok himself to revert him back to a previous state, turn him into a baby (assuming he was one), age him to death or nonexistence, etc. will not work on him at all. However, something as powerful as the Hourglass' scale of time hax will affect him.
They also might have some form of Acausality, perhaps types 1 and 2, but I'm not familiar or knowledgeable on time mechanics, so help me out on this one.
