The "can't do people" are creative, but only when it comes to finding reasons not to do things.
They hug barriers, love delays, and bask in complexity. They memorize qualifiers, move only in committees, and know the way to every bureaucratic maze. They never have enough information and, in their eyes, deadlines are mythical beasts. They can muster a legion of ways to say "No" and, on good days, "Not now."
Since they often are well disguised, a crucial career skill is being able to spot them.