Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Panels are ok but the corners are a little too soft for our taste. We use bolt mesh for more control in that area.
If you are a machine operator you most likely buy panels...if you are a machinist you most likely buy bolt material. At the end of the day it comes down to balancing production time, effort and money and each of us get to decide how to manage that balance.