What is the purpose of this error message?
It happens every time I queue to all 4 LFR queues. If you try to queue all of the 4 one after another, it gives you this message on the third queue.
Does it stop you from queuing more than 2 LFR wings? No, in fact, you can always queue to every LFR wing available, currently 7 in Dragonflight, but at the end of Shadowlands, I think all queues at the same time were possible.
A mere 5 seconds after this error, the game lets you queue for the third and fourth wing.
So, what is the purpose of this? What is the difference between queuing the four wings immediately and doing it with a 5-second delay?