I can count on one hand the amount of PS4 games I'd consider playing with touch screen controls. Mostly PS4-based visual novels that I'm yet to go through like Steins;Gate 0, Chaos;Child and Psycho-Pass: Mandatory Happiness.
That said, those games are all quite long and I've struggled to find time to really sink into them. Incorporating playtime into times when my other half is using the TV is gonna create a lot more opportunities to do that, so this is actually a good thing for me!
But I can't see myself playing anything that requires a modicum of more fine input control. Maybe some point & click adventure games at a stretch. But if they want this feature to be useful to most people, they really need to add DS4 support.