We had ten years of skeuomorphism also showing it just straight doesn't work in a lot of places.
We had 30 years of skeuomorphism starting with the Mac in 1984 and it always worked although suboptimal. Flat can be better but when not done right it's worse than skeu. I personally would rather have a UI that is more cluttered but always discoverable over a UI that isn't always obvious.
We can't expect UX people to do their jobs in the same way we can't expect programmers to do their job correctly.
We had 30 years of skeuomorphism starting with the Mac in 1984 and it always worked although suboptimal. Flat can be better but when not done right it's worse than skeu. I personally would rather have a UI that is more cluttered but always discoverable over a UI that isn't always obvious.
We can't expect UX people to do their jobs in the same way we can't expect programmers to do their job correctly.