I guess a situation I could see maybe is Boba Fett debuting on December 22nd (which would be Week 5 of Hawkeye). It would be just in time for Christmas meaning people would have extra reason to get a Disney+ subscription for Xmas. You'd have the premiere of one show and the penultimate episode of another all in one week. Spider-Man: No Way Home comes out in theaters that week, though.
Idk, it makes a lot of sense to premiere Boba Fett on the 22nd in terms of getting subs, but with No Way home & Hawkeye, I feel like that's just a lot of Marvel for one week, never mind star wars on top of it. It just seems more beneficial from Disney's end to wait until the first week of January to air Boba since it wouldn't be such a crowded landscape.