If you wanna play only DT, just keep playing DT only. Same goes for Hidden. Some people say you get worse at nomod if you play HD only but I don't see the issue. You are not forced to put off HD ever except for maybe tournaments or hosts that refuse to put freemod on.
Dunno about HR, I can't see how spamming HR on lower rank is fun.
Edit: Well, you can't put DT on in MP if you care about that, but if you just play SP then there's no reason to quit playing it / not play it all the time.
DT is no different from a lot of high bpm nomod these days so it doesnt really matter. People who say it is no skill are still stuck in 2012.
"I don't accept that improvement has stopped coming towards me. Even if it will stop coming towards me, it's because improvement never even came to me anymore, while I always practiced at my best. That's not a stagnation that is supposed to happen, only fools would think that way."