If by useful you mean in a societal scale, I agree. If you mean on a more prosaic level, I'd say that's not true in small bootstrapped companies.
Au contrair. mon ami. Office workers are busy keeping themselves in the office, which means that the vacation spots, and such are riffraff-free for their betters until the next major holiday break.
That's quite useful.
I see some people lack a sense of humor and/or that a 'truth' perhaps cuts too close to the bone.