It's why some are not invested in everything and picking and choosing what to view poste Endgame. As the MCU makes more new characters in new corners of the world it's going to be harder to justify them all leading to one big story at the end of each phase. Like for example, everyone is speculating the next phase will be mutants. Who will be the big bad? Probably Mr. Sinister or Magneto. Thing is you don't need the entire Marvel lineup to handle them. The X-Men are enough, so really there's no reason to include teams like the Avengers, Fantastic Four, Guardians, Midnight Suns, or whoever else they have around to help fight them. That doesn't mean they can't/shouldn't make projects with those other teams in it and give them there own big bad more suited for them.
I understand why that's harder for more casual audiences to get. Like having a street level team, a supernatural team, a cosmic, a mutant team, a more traditional Avengers team can be seen as a lot. It's certainly sizeable in the comics to the point dozens of them are in limbo. But I also feel we're getting to the point where they need to make other teamups for these characters especially if they are "playing it safe" Like honestly I don't think they even needed the entire Marvel Multiverse to handle Kang. Has Kang ever truly been that guy who needs the entire Marvel-verse to rally behind to defeat? People complain Ant-Man beat him, when you have source material of Captain America beating him too.