I agree with that, and I think Blizzard agrees too to some extent.
Layering did get cut back, but it still exists overall.
I think they said something about layers resetting each night?
Like, if a zone is uber-populated, more layers will appear, but those layers added won’t be removed until a daily reset at the end of the night or something along those lines.
I’ll have to find it.
Edit: Found it.
Specifically it had to do with Battle for Ashenvale, but I’m sure it applies elsewhere too.
The devs certainly know dead layers is an issue.
That’s probably why.