I'm a new player so my perspective is different, what is the benefit of Expert Matching seems that most content in this game has no failure state it does not matter if your team sucks you still get completion.
Is it about faster clears? Urgent quests are hours apart and limited by time of day and I don't imagine people using triggers are doing it via randoms.
Is the player base large enough to justify this system its easy to get groups in urgent quests and the daily recommended quests but for everything else you are likely going in solo.
Would a Cofy quests locking off the highest difficulty behind some competency measure not solve this problem better than splitting the player base as a whole.
Also posting from my phone so sorry for anything amiss.