Yeah I wonder why, its almost like this game is in a really rough spot not very many people play this game as much as other games, the queues rely on people to populate it and with the amount problems this game has is the root cause of it, you want better queue times then the game needs to balanced, well optimized otherwise the queues wont get better, forcing mandatory crossplay will not make things better.
There are server improvements they could do but for this being a small company they only do much at a time, it took Dbd 4 years to finally get the ques in a decent spot but even then they still fuck up.