I just think fundamentally that people had bought into the overarching universe and the build up to the infinity war finale as an actual conclusion, and people were sort of on board for some of the earlier epilogue-ish movies/shows, but then universal Marvel fatigue set in. And that was the backdrop for all the other issues people are talking about like the oversaturation/quality/allegations etc.
Post-End Game, I think the only stuff I've seen have been the second Spiderman, the first episode of WandaVision, and She-Hulk. They just kinda exploded with content and it felt even more like homework than the old stuff without skipping around, so I never got around to watching the things I actually wanted to see.