Time heist? can't they go back to first movie in marvel universe and fix every single thing then?

Rating: 2/10 (12 January 2020)

Unless you can sit down your brain, or you have a shut brain already, there is no way you can pass the main twist when they get to go back in time using (insert nonsense wrong science sounding terms here). Why does it matter? because everything becomes predictable (spoiler alert, there is nothing to spoil)
Why stop there then? just go back in time and fix everything else. Martin Scorsese is right, this is not cinema.