Originally Posted by
Skulltaker
No, you're simply wrong =) The golden line is HER universe, not the one we watched. And yes, removing the stone would doom that timeline, and returning it will fix their timeline.
Nothing that has already happened can be changed. If your interpretation of their timetravel was correct, Loki escaped with the Tesseract, at the end of Avengers, and wasn't returned to Asgard by Thor. Which we already know happened. though. As has been clearly stated: You cannot go back to your own past and live in it, you can go to a point in the past and make a new future, which will be different from what you know as the past. The writing works perfectly fine, it's just the writers trying to be to clever in this interview that screws it up.
At the end of Endgame, we are left with the prime timeline, the 1950es timeline where Steve Rogers lives, the 1970es timeline where Stark Sr met his adult son, the 2012 timeline where Loki escaped, the 2013 timeline where fat thor met frigga and removed the Hammer for a moment, and the 2014 timeline where Star-Lord suffered a brief lapse of unconsciousness befor getting the Power stone, the timeline without a Thanos and his army.