The only way to accurately gauge Force Abilities now seeing as how Star Wars is so expansive is to put everything is under one umbrella. Meaning we should just assume Force Pushing is viable in the OT. Especially when Vader is able to hurl objects at Luke
But then, if Luke and Vader never pushed each other in both TESB and ROTJ when they had the chance, makes sense to think that they really couldn’t.
He does? When?
Yep, he does here when he pushes Rey.
At any rate, the easy answer is “because he’d be unstoppable and that wouldn’t make a very good movie.”
I agree, but generally in-universe explainations are also nice, so to keep things more (in-universe) realistic. Otherwise, it turns like in AOTC, where Dooku first tries to kill Obi-wan with a final blow (adding tension to the scene), and then, after defeating Anakin, he just changes his mind 😄