You realize Street Fighter 4 and Super Street Fighter 4 Vanilla are the reasons why the Fighting game genre regained A LOT of it's strength back, right? Fighting games were on the verge of death. We would not have a lot of what we have today if it weren't for these games sparking a lot of life back into players.
Also yes we call them bounds in DOA, so that is what they are called. Sit-down stuns and bounds are entirely different stuns and have different properties.
Genfu's 3PP was never a sit-down stun, it was a crumple stun, and still is a crumple stun. Crumple stuns are slightly similiar to sit-down stuns, but do not provide the same stun properties. And as for Genfu, if you DO NOT stagger escape the first 3PP crumple stun, the rest is guaranteed.