Well, I've been playing the drums for 20+ years.
And I must say, if any one of the musical directors who I've played for ever talked to the band like that, the performance would not improve but get worse.
I would be so nervous I couldn't enjoy the music.
Yes, you're there to do a job, but you should also enjoy it.
I can perform well when I'm under a little pressure or stress but not when I'm nervous. If you have a form of tunnel vision and strictly focused on every milk & cranny of the music, you (I) cannot enjoy it.