They're capable of supporting mouse and keyboard. For some reason most games just don't. Like on my PS5, anything that uses a mouse style menu, I can use a mouse to operate. I can also use a keyboard to type in input boxes with anything. But the only game I can fully play with a M&KB I've tried so far is Call of Duty. Which is nuts because Stellaris, Civilization and City Skylines are on this system, too, and they would very much benefit from full M&KB support.