Metal studs would have an excuse, but it has been a problem for me even with wood framing.
One GC frames and hangs the drywall, he subs out the drywall finishing. The only other things he subs is electric and he hires a plumber for the drains, but does the lines himself.
He expects me to start the rough as soon as there is felt on the roof, and wants it ready for insulation and drywall by the time the roofers are done. He'll play "hurry up" by placing stacks of insulation and drywall in my way, seemingly unaware that this only slows me down. "The illusion of pressure" I'm told it's called.
The next house I'm wiring for this GC has prefabbed walls, with one side already rocked, and had it not been for this thread, I may not have realized to allow more time for those boxes installed and would have underbid again.
Thanks for bringing this up!