It's this sort of thing that resulted in me dropping out of watching the Arrowverse programmes. Make one that simply doesn't appeal to me at all, when I have to be fully invested in all the shows in order to keep track, and I'm more likely to just drop them all instead. Hopefully that doesn't happen here.It isn't, though. They're separate shows with different titles, both marketed at roughly the same audience yes, but I wouldn't expect, for instance, an entire episode of Hawkeye to be dedicated to character development for Wanda Maximoff or Sam Wilson.
The Book of Boba Fett is a short series dedicated to a single character's story, and dedicating an entire episode of that limited run-time to exploring an entirely different character remains weird and out-of-place.
If I want to do a full binge of The Mandalorian at some later date after it's got a couple more seasons under its belt, I'm probably not going to sidestep into watching BoBF after season 2 - but that's going to mean skipping past several plot and character developments.