I tried to get into "Legion" but couldn't. I don't know if it was the pacing, or I just wasn't interested in the character. I found myself falling asleep. I couldn't believe it was an X-men type. I guess it would be like if there was a show about when Charles Xavier was a kid, but there were no X-men.
The sitcom material isn't in every episode. The first 2 have the most but there are strange "out of place" situations that contribute to the bigger picture. The 3rd gets much better. The 4th episode has no sitcom material. Episodes 5 and 6 bounce back and forth between "sitcom" and the real world. 7,8 and 9 have no sitcom material. In later episodes the sitcoms tie in better. You may be a little lost in 2 future MCU films without having seen the show.
Why would Disney hold them back? Look at The Mandalorian. That show has done wonders for the Star Wars franchise. I watched a few espisodes of both Daredevil and Punisher, even the other series Luke Cage, Jessica Jones, and Iron Fist. I fell out of interest for them. As I said with Legion, maybe it's the pacing of the shows. They seemed slow to me. With WandaVision, it always had my attention. There were twists that had me thinking and wanting the next episode. Those other shows didn't keep my interest like WandaVision did. I think the action in The Falcon and The Winter Soldier, maybe even Loki will surpass those shows, you never know. Heck Hawkeye, She-Hulk, and Moon Knight could as well.