It's not just Google sadly - Microsoft had that before them (in every single version of Windows you had to get used to a new UI in the file explorer), and even

It's not just Google sadly - Microsoft had that before them (in every single version of Windows you had to get used to a new UI in the file explorer), and even Mozilla likes to tweak the UI of Firefox to death. Actually Google Chrome is better in this regard. Sure, they add new features too, but those fit in with the rest, and the design changes are gradual (less disruptive than Firefox' "our tabs now look like buttons").