Servers with no queues literally started having queues over night.
The reason why was they removed layers and thereby lowered the number of concurrent logins.
This really really isn’t rocket science or even hobby story rocket science man.
They specifically said 1 layer would have approximately the same size as a vanilla server. We now have 1 layer per server, hence servers are now at roughly vanilla size. Maybe you just didn’t play on a high pop server in vanilla?