"He who marches out of step hears another drum." ~ Ken Kesey
On the flip side, I don't know how many times I've called out to use a particular mesh in the art sheet, only to find out that it's being run with a 156 because they were all out of 305's.
Not to pick a fight, and this is only our shop and the few artists we've had in here, but none of them were even slightly qualified to choose the right mesh count for a particular job. And one of those artists was quite good and I tried to teach him everything that I knew and was learning at the time. He was here during our "renaissance" when we turned the corner from being just another print shop to putting out decent quality stuff so he learned a lot, but still, he didn't learn more than I did. I'm sure there are some artists that know as much or more than I do about production, but even if they worked here it's still my call to make because I've been out here doing it for a long time and I can't remember the last mistake I made choosing a mesh count...so I trust ME.