Farerb…where is Sword In The Stone in 4K? If it’s D+ then a stream is not really a suitable solution. In fact, I prefer a BD over a 4K stream (with all of its banding) if a disc isn’t available.

Cinderella is the first animated film they have released since November 2020! Maybe it's a sign that they decided to release the old classics on 4K, but it could also be a one time thing only, maybe they finally realized they need to fix Cinderella, who knows?
Up till now, all the 4K's have been 90s Renaissance, Pixar, live-action and current, simply because they've had the high-definition (IMAX) upgrades.