I tend to absolutely hate time travel gimmicks in fiction because they almost always have some clownish "oopsie woopsie we fucked up the timeline, but if we act out whatever we just broke/killed/whatever it'll be like nothing changed at all, lol."

Sometimes it's like "be very careful... butterfly effect and all that wink wink nudge" which is not how the butterfly effect works you clowns. Just being there already changed everything ever afterward.

Then there's the ultimate asspull: "apparently what we did was what already happened all along."