Discover is only good for flatpaks in EndeavourOS
Also not entirely ;-), for example Plasma Addons and Application Addons from KDE Store can also be managed this way. But overall I guess you are right, as its not recommended to manage (pacman) system packages with Discover. I don’t even know how to set this up, if I wanted to. Half a point goes to you. :p
If its really important hardware, consider repairing the usb controller.