I think there is some small reading ability that transfers over (maybe not directly but knowing how to play one rhythm game will kind of get you to understand the importance of not lazily reading in another) as well as a very significant transfer of speed/stamina.
I'm pretty bad at mania, though (200 pp flat top play), so I don't have a good grasp of how to actually play the game and how different skills interact.
McEndu wrote:
At least it don't really transfer the other way round because aim is pain
most std players only stream with left hand anyway, for mania both hands are for streaming and none are for aiming
A huge portion of streaming has to do with technique and not your raw muscles or whatever. I'm not saying that my right hand can stream as well as my left, but I can deathstream 220 bpm on my right hand without mashing/doubletapping (although my control is noticeably worse and I can stream higher on my left), presumably because I already have a grasp of a working technique.