Gameplay-wise there isn't much to look or adapt to. Even though this sounds like a nerf, it only affects stuff that people should not be doing in the first place.
The most important thing, in my opinion, is this:
(at 12:30)
Before, if your opponent were killed before the last hits of the super, he would fly in the opposite direction. This means losing corner advantage in many cases. This will not happen anymore since those hits will never kill. In this case, this is a buff. (unless you were not in the corner but yeah)
When else do you NEED the damage from the first hits to confirm a kill? If it was a combo ender... never. It makes no difference since the super will connect in this case.
Attention is required in cases where the super does NOT connect. Where there is ONE SINGLE HIT of damage on either blocking or hyper armor covered opponents. We're talking about reversal supers here. And I believe that in any case your reversal Fenrir Drive would kill your opponent, so an H Updo would.
Regarding what you said about setup time (since there's more screen time every time this super connects, as it will never kill earlier anymore), I'll play the design card. It was intended to last the entire duration, as any other super does (or at least should). So nothing's off here.
But well... I was the guy who suggested it so what do I know. Play your arguments :)
