Doesn’t the 4th hit of hands whiff on crouchers? I always FADC after the 4th hit too but only on standing opponents.
Also, because at 19 frames Gen’s forward dash is kinda slow (go figure) it’s not a trivial link afterwards; you will want to dash cancel your focus attack on the first possible frame. I hold forward during hands, then tap forward + mp + mk to be sure.
There are reasons why you would want to use FADC combos vs super; with FADC you tend to maximize damage opportunities as you get them, with super you’re limiting your damage (as well as reversals) then waiting for an opportunity to land your super that may never come. Then again the super is more damage efficient if you tack on the ultra and more reliable given that nobody’s execution on fadc combos is perfect.