https://us.forums.blizzard.com/en/wow/t/topic/526562/1
See how it’s 404? This is what it said.
https://i.imgur.com/WKA6a3S.png
So basically, they said they were “monitoring” the player population and found it suitable to remove layering. Then there was 2hr+ queues immediately after. Blizzard then re-implemented layering 3 weeks later (because they’re slow in the head) effectively indicating that they had no idea what they were doing in the first place.
The only reason they even implemented layering is to prevent queue times. The only reason they should have to remove layering, is to prevent queue times.