Re: based on 71 users
The studies were done in the 80s.
Faux-3D where clickable things look like they stick out of the screen and repond to a click by appearing to become depressed was the consensus opinion for "best UX" throughiut the 90s and 00s.
Several different studies have shown "flat" to be less discoverable and slower to navigate.
It's just that the design people have forgotten history. No doubt this will be "rediscovered" soon.