Separation of concerns

When people separated from the actual work make unreasonable time demands, they usually get substandard work in response. As the saying goes, "faster, better, cheaper: pick two". If you want it faster, you need to spend more or sacrifice quality. Many managers are of the opinion that if they just crack the whip harder, they'll get the work done faster, which also means cheaper.

Mokalus of Borg

PS - Beware of managers who don't also work on projects.
PPS - I'm aware that some people have the simpler motto "Beware of managers".