Fox was bought for the European infrastructure so that D+ can be taken internationally.
Secondly, it was for controlling share of Hulu.
Thirdly, for its several TV and movie studios to make content for D+ and theatrical release.
Fourthly, for 20th Century and Searchlight to make adult and award-winning movies (which was something Disney was missing).
And finally, for its back catalogue to put on the streamers and raid its IP for future content.
Bonus: Fox Marvel was reunited with Disney Marvel; and Fox distribution rights of early Star Wars was reunited with Disney's LucasFilm distribution rights.
Bonus: Talented execs at Fox now working for Disney.
The parts of Fox that Disney doesn't need has already been sold off (sports networks) or written off (European linear channels were thrown out) or consolidated. There's nothing extraneous to sell.
Or, as Disney put it in its warring Slide Decks:
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