Notably, Linux support sucks with those. I have one, and you can't do any of this on Linux through their software. There are ways to do it still though, as you can do with any controller really.

Is there any 8bitdo controller with 4 additional back buttons, too? Those are clutch for dual stick games; I'm almost always remapping then to the face buttons so I never need to stop moving or looking to do an action.

But yeah; the touchpads are critical. So many games become playable with touchpads. Nested radial menus allow for effectively infinitely many controls, which allows for most simulation games. Many Path of Exile builds are unplayable without back buttons and trackpad radial menus, due to input requirements.

tbh, I often play games on my Deck instead of my gaming PC for the controller. It's really that good. (Although nothing beats kB+mouse for FPSs.)