i’m not a super prolific gamer by any means, but I have 30ish games on PS4, a good mix of indies and triple As, and basically none of them seem to use to touchpad in a way where you couldn’t just use a normal button or a normal button plus an analog stick.
You can play guitar on Last of Us 2 with it. The DS4 seems to have better sensitivity than the 5. I could pick individual strings on it and it doesn’t seem to work as well on the ds5, but both are a neat use. Ghost of Tsushima has functions mapped to swiping the different cardinal directions. Not really anything else I know of