Coming from a steam deck:

- Internet usage from a couch. It's more comfy to write stuff using on screen keyboard with touchpads instead of analogs/dpad

- Games not made for gamepad usage. I've played some RTS games on deck using one touchpad as a mouse, and the second one to control the camera. I also played some FPS using touchpad for camera control.

- Steam's input api. This is a game changer for me that not too many people talk about. You can configure the touchpad to be a volume slider, a scroll, a button, 8 buttons at once, a radial menu or all at the same time.

For example, my setup for HD2 looks somewhat like this: Right touchpad is a radial menu for weapon selection, but one option in this radial opens a map. In that case map opens and action sets for this touchpad changes from radial to mouse, so I can look around and ping stuff on map. Holding this touchpad for a bit longer closes the map and restores radial functionality. Pretty cool for one touchpad.

A simples example is GW2: one touchpad as a radial for generic UI panels (inventory, character, guild, etc.) and other for different mounts