outer spade
Nonetheless the feature is awesome, there isn't alot of couch play co-op games out there on steam and the sheer idea that this is possible in the first place is just awesome. Most difference i get from doing this is a framerate drop from zombies, though there's no lag input atleast in my own experience.
Also the UI menu on the left hand part of the screen is not needed, as every single input is done on a controller anyway, so that's the only thing that's actually in the way - meaning you have to click over the inventory UI once to let it overlap over it - speaking of which its already customized and fitted so you dont have to manually set up the inventory yourself! Mods like simple status, replace bandage, or even the minimap would be in the way though.
To add, if anyone tries this - note that this alone is being run on a steamdeck, using the official dock. Controller support in game as of B42.7.0 is currently not fully supported, despite the huge amount of updates and fixes the game has already got for controller support, mainly the crafting system and mechanics.
The two main mechanics so far that I've seen not reach support for the controller is the new fishing mechanics and the aiming system. You can aim, sure, but there's no crosshair and its less responsive atleast on my end.