"What is Early Access?
Get immediate access to games that are being developed with the community's involvement. These are games that evolve as you play them, as you give feedback, and as the developers update and add content."
You are too fixated on the word/name "early access" "stable", and ignore the logic behind it.
The stable patch doesn't make it a complete/final game, it means the changes have been tested and relatively stable(less crash) to the beta branch.
Nobody ever said things made it into stable patch can't be change, but as we have a beta branch, those changes should be tested on it before going to stable patch.
Which is the purpose for having a beta branch; to uncover problems within new changes.