Jack of all trades. Master of none.
I’d venture to say that many consider that a compliment. But even if you take a more flattering definition of jack than any common fellow, it is pretty clear that “master of none” rules out superiority at any one skill.
So you really need to read between the lines when Fred Wilson advises that you need utility infielders. No one views a utility infielder on par with their starting shortstop or center fielder. But players who do the little things and get things done are as valuable as anyone else on your team.