It's not even the shippers.. Customers DON'T CARE, it Says FEDEX and that's all that matters to them, most don't even know there is a difference between Express and Ground, I Have customers all the time saying "oh the other guy was just here, you guys make a mistake this morning and both load my stuff"
and of course FDX made it even more confusing by making us all the same color, since for years we've been telling customers GROUND is GREEN(on the trucks) and Express is Orange, yes I know they say Express and Ground, but customers only see the big letters(and the arrow)