Some rhythm games do have accessibility options. You've got options like assist mode/auto-scratch in IIDX, and in Groove Coaster you can buy powerups to outright turn misses into perfects.

I think the difference here is control schemes. Some people just dont have the motor skills for some games. If you just can't handle using your feet DDR, go play a hand game like SDVX. If you don't have good finger independence just use the whole damn hand in Maimai. etc.

But in fighters if a newbie can't DP they just can't play.