At this point, you kind of do. I mean, Doctor Strange 2 would've been an annoying watch if I hadn't previously watched Doctor Strange 1 and No Way Home and WandaVision and Infinity War AND Endgame.
There are certain movies/shows you can watch on their own, but the core is being built so that nearly everything before the next up, is required viewing.
Eternals is probably safe to watch on its own, but I'm not gonna do that again.
I agree with
@gaporter.
And like I said, at this point, it's always going to feel like part 52 of a story we're not caught up on. A lot of these flicks don't hold up on their own.