It ebbed and flowed with Bill. He would tackle super hard tasks at Apple or General Magic and isolate and hyper focus. I saw this from others at General Magic, Be, Apple, Danger, and even more current Amazon. You can even read about this in Soul of a Machine. I suppose the trait of someone on a critical path doing this has been going on forever.
Bill also had some different definitions of “getting stuff done”. At General Magic when others were driving super hard to get things done, he would make soup and ensure that everyone was eating and not totally driving themselves into the ground.