But when promoting the game and its supplements, Mike made loads of statements likes this:
https://www.gameinformer.com/b/featu...ostPageIndex=1
or this:
https://twitter.com/mikemearls/statu...eview-hints%2F
That clearly speak to 5e being sold as a stable edition where books sold will be consistently reliable. And for the most part they have been! That's been a strength of the edition for the most part, I would say, but they've stuck to this strategy when they arguably shouldn't have - failing to update the base monk, ranger, or sorcerer for four years, as one example. But again, just because I think Tasha's ranger is better (though honestly it still sucks) doesn't mean that I think the original PHB should be unavailable if someone finds the favored terrain/foe business more interesting.
Suddenly going "surprise, your book we sold you a year ago is now now outdated and we won't sell it" is... yeah, its dumb.