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.
In Gravity Rush 2 you flick it in different directions to change modes.
On a smaller scale, some games split the button in half so the right side is the Start button and the left side is the Map button