I don't know why you guys keep calling ketsuipachi a fanservice mode?
Sure, it appeals to Ketsui fans, but even people who never tried Ketsui should like it, because it's good - because Ketsui is good! It's a very alternative take on the game, and that alone makes it more interesting than eg. mode 1.51 which are just a few tweaks (some very good tweaks, though, IMO, apart from the laser-score thing, but definitely only tweaks that will be noticed by, yeah, actual fans!)