[qqwref]

Yes, the "vibrating age" is pretty much over. Now the most impressive scores are incredible speed achievements. There's really no reason that couldn't be done with double setup too, though, with enough time, because double setup is fundamentally better than single setup. But double setup also allows someone to do a Dossar style "controlled mash" at twice the speed, with 1/100th of the skill requirement of actually playing the thing. Is that really something we want to see, D4 players easily FCing anything in the game, and top people getting a C on 900bpm stream charts and files as hard as vrofl? Take a hard 8key stream file, offset the right hand by a 32nd, layer the two sides on top of each other, and you'll see what kind of files people will be playing after a year or two of double setup being the norm.

If you want to do double setup, play it as a separate thing. Maybe you'll get some competition. But in almost all cases it destroys the impressiveness of speed scores, destroys the feel of playing a chart the way it's stepped, and makes it way easier to mash through anything difficult. Who wants that?