Russo Brothers: Alright, to explain time works differently I am going to have everyone be incredibly disappointed that their favorite time travel movies are false. Then I will emphasize multiple times that time travel isn't linear.
Certain Moviegoers that love being obtuse: HOW CAN THIS HAPPEN TIME TRAVEL IS LINEAR!?!?!?!?!? I DON'T CARE WHAT THE AVENGERS SAY I AM GOING TO MISUNDERSTAND TO THE ANCIENT ONE'S LINE THAN PRETEND I KNOW MORE THAN ANYONE!
No, seriously, it's not that hard to understand, nor confusing. At the very least it's far more understandable than people finagling and twisting logic beyond comprehension so they can pretend the ACTUAL STATED REASON HOW TIME TRAVEL WORKS doesn't exist.