He's a great developer and a shitty producer. When he's in charge of his own projects there's nobody holding him accountable and it just spirals into madness and then halfway through when all the hard and fun work of really designing the game is complete, and all that's left is the boring business of production and finishing the damn thing, he just ADHDs off into the distance chasing the next cool idea/design challenge

Somehow he's able to keep funding that arrangement, so it hasn't changed.