He notes in another article[1] that macOS turns on BT on every update, and apparently the behaviour is "functioning as intended" (Apple's own words). What's not answered is why Apple do this. Possibly as trivial as avoiding bug reports or support issues about BT devices or features not working? Apple already control the stack from hardware to software so it's hardly like they would need a nefarious reason to do this.

[1] https://lapcatsoftware.com/articles/bluetooth.html

Also is this the same Jeff Johnson of rpm5 "fame"?