The best Spider-man movie to date features Peter losing his powers and giving up on being Spidey entirely. The (debatably) best Superman movie also features him losing his powers. I don’t see your point.
Yes, and he discovers he makes a mistake and get’s his powers back. That’s not the same as permanently altering a character.
Isn’t that what Luke does though? Even though he failed, he decides to become the legend one last time (and that may be my favorite scene in movie history). So he, in a way, got his power back, meaning the change wasn’t permanent.
Yes, but the Spider-Man film took much more time to develop the story and explain how Peter Parker came to his decision to give up on his life as a superhero. It wasn’t just a short flashback scene with a few lines of dialogue. I can sort of fill in the gaps, but would have liked to see more of Luke and Kylo before his turn and what motivations Snoke provided for Kylo to allow the darkness into his heart.