It's taken me close to a year with my current system to have it set up right. I don't care how much you spend on a system. It will take months to reach it's full potential...tweaking the room, components and cables, isolation, ect.
Exactly, so people should cut the exhibitors a break!
Another consideration is that exhibitors combine resources to pay for a room and they don't know how things will sound until they arrive. Right or wrong, that is the economic reality.
But I understand most attendees don't have the time. And neither do I sometimes and miss things too.