(SF6 casual) is inputing any normal during DR gives it an extra 4 frame advantage?

New to SF6, is inputing any normal during DR gives it an extra 4 frame advantage?

But this extra 4-frames advantage doesn’t apply to specials? Only normals and unique attacks right?

So basically the whole point of DR is that it opens up completely new combo possibilities via changing the frame data and the on block/on hit advantage, and it also makes unsafe moves safe/unpunishable and thus basically helps with adding further pressure?