You "should" not have to watch all movies. Watch whatever movies you -think you'll- like. There's no need to watch all DC movies to understand the DCEU, and you certainly don't need to watch all MCU movies to understand "Endgame". I just watched "Iron Man" 1 and 2 and Avengers 1 and 2 and I got the plot of "Infinity War".

Why can’t people think for themselves anymore? If you want to watch something, watch it. You don’t need the approval of others.

Can I delete this now?

Watch and read whatever you like. Comic books are an hobby.

You should see Snow White and the Seven Dwarfs instead.

Not my favorite Disney movie, although it was obvious since the first scene it was made by craftsmen who knew what they were doing.