The problem with adding harder charts is that they have nowhere to go on the grading scale except to be coupled along with all the other songs that are 10s now. I explained this already.
The natural progression of difficulty will eventually lead this current grading system into a state like IIDX 8th style had, where practically half of the new library was rated a 7*, which was then the highest possible difficulty, not because they were just as hard as all the other 7*s, because they weren't at all, they were just rated 7* because there was no other way to show how hard they were.
Then it becomes an issue where player 1 plays 7*A, and 7*B, and there's such a vast difference in difficulty between the two that it becomes nonsensical and confusing for everyone, not to mention unfair to the player because if he/she can pass 7*A, but can't come anywhere near passing 7*B, how is he/she going to be able to know which songs he/she can pass?
That system was changed because Konami realized this, and gradings now go from 1-12, and all the songs were re-rated to be properly bracketed for players, and for the mostpart, they're all bang-on and very helpful. When I progressed to 9s or 10s on IIDX, if I could pass one easily, I could pass them all, that's how it should be.
You should be able to accurately progress through the game based on the difficulty ratings. If you can pass a 9 with ease, you should be able to pass ALL 9s with ease, likewise for 10s.
We can now easily pass songs like MAX300, but many are still failing to even come close to AAing songs like FaxX or Felm, yet they're both rated the same thing.
The time to change this old grading system has come. It changed when "catas" were the hardest thing available, and it needs to change again now like IIDX and PnM have recently.
Why are people talking as if DDR doesn't have any hard songs? PSMO, which was created a looooong time ago, is still harder than most 11s on ITG, and alot of the new boss songs are probably well within their right to be considered 12s. Every mix they've upped the bar on difficulty, I don't know what you people expect except for nonsensical keyboard charts that are just stupid and not fun to play.
Like, you guys are being so vague, what's "hard"? Seriously.