it's not that the bees don't work above them. they do...after the work is started. the biggest problem is that they come recommended for new beekeepers, who have new foundation, etc. and the bees don't want to get up there and work. no one tells the new beekeeper and the hives swarm.
once the bees are up there and working, they'll keep going back to finish the work.
i just find them one bother that i don't need except for doing comb honey. of all the things that can be skipped, this is a big one for me.