Why isn't there more controller hotkeys?

Been wondering this, we have r1 L1 start and select to exit, but that's it

Is there something stopping controllers from being able to emulate an alt f4 to close games without an exit to desktop feature, or to bring up steam overlay, or to really do anything or have us map it ourselves

I know there's server commands you can send but that's an extra step, it'd be cool to just have controller hotkeys assignable or accessible