This reminds me of Subreply (subreply.com), a tiny text-only social network that keeps things extremely simple and fast—worth checking if you like minimalism in apps.
More buttons? Since I lost my power button on Pixel 5, I'm using it only with gestures: touch the fingerprint sensor to unlock, swipe down on home screen to lock it. I think a slider on the notification area can be used for volume up and down for a true buttonless experience something Steve Jobs would have loved.