When did "Finger Snap" became a necessity?
Sorry if this was discussed before. In the previous movie, Nebula says something like "if Thanos gets all the stones, he can destroy the universe with a snap of his fingers". This was not to be taken literally, it just meant that Thanos would have on his possession an omnipotent, godlike power. He didn't really want to destroy the universe, nor did he need to actually, physically snap his fingers to do so. But later on, this was taken literally, and at one point they are literally trying to stop him from snapping his fingers and stuff!
I'm not deep into the comic book lore. Was destroying half the universe Thanos' real plan in the comics? Was it his original plan in the first MCU movies? And was it actually, really necessary for him to snap his fingers to trigger whatever he wanted the stones to do?