They can implement it all they want. Doesn't mean people will use it. Heck an intermediate hall has been asked for for years. Part of the reason is a difference in culture between JP and the rest of the player base. They use the DF and PF differently. Most see what many NA and EU would call the bare minimum as unacceptable. As everyone tries their hardest to not be the one letting the group down. Even if we finally got something implemented you'd have the same people who give the typical responses to anyone asking nicely to improve groan and complain about it.

Specifically if it was handled like the ARR extremes and CT where you have to do them before continuing whatever expansion story you were going through. You know the whole ugh why do we gotta do this "hard" content? The games I play shouldn't feel like work. While also getting those who go and say things like oh well why should I have to do this when the rest of the content I do is so dang easy I could have my cat play for me. And why? Because why should it matter as long as we cleared it. Heck, there's people who have said as long as you have that sprout marker it's totally fine how they act or perform cause they're still a baby. You know even when you run into said sprout in Amurot. Which yes I did have that happen.

So, even though I would love it if we had a way in game that was there to actually help improve people's performance in such a way that you'd only know from them getting a title or gear that came from it I don't see it happening due to the Devs having been very leary of wanting to put something in.