My main gripe with both the OG and this iteration is how featureless it's reported to be without the heavyweight steam client running - just basic trackpad and keyboard mappings - no gamepad emulation for platforms that expect a gamepad/joystick but where you can't or don't want to run steam.
We all a love valve but any HID peripheral requiring logins and a mandatory storefront client should leave a sour taste, even if you're 100% in on the value add.
Steam Input is fantastic I just hope the fallback behaviour is configurable with a FW update or something.