Call me an old man, but I'm no longer sure that annual major OS upgrades are even desirable.
Adding features is great, but half of the changes feel like product manager brain "changes to show we made changed things".
I actually don't need buttons moved around in photos/mail/finder annually. I don't need the design language of the windows changed annually. I don't need the icons of all my apps to change annually.
An OS is a tool that serves the purpose of granting me access to all my other tools (apps).