Crank turning question

I have taken many cranks to the machine shop and every single time the machinist said they needed to be turned. Weather they were out of round or the journals were tapered. I once took a brand new Ed Hamburger crank to be polished just to get alittle more bearing clearance. When I came back to pick it up they had turned the crank undersize. I said wtf, he said it was out of spec. Kinda makes me wonder. Kim. I should state that it was a few different machine shops over the years.