I miss something like the Principle of Least Astonishment for design. Why every time there's a revamp of a website the new design is more astonishing and less

I miss something like the Principle of Least Astonishment for design. Why every time there's a revamp of a website the new design is more astonishing and less clear? Why the search button in Google Calendar is now blue? Why new design is usually a tease on our muscle memory?