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Well, it does give them a way to jump/climb up and down without jumping 3' or 4'. Lots of people use that style of roost without a problem. I don't care for them because it is something else to fight over: the highest in the pecking order gets the highest roost. OTOH, there are always some in the middle and at the bottom of the pecking order, so.... Personal preference.
Bumblefoot I think most often results from things like a splinter on the ramp, a sharp object in the yard, etc. It doesn't come from hopping as such, it comes from a small wound. They can, however, get sprains and even fractures if they jump down and land wrong. Mine have plenty of room to flap wings and don't seem to have any problem getting off the roost. But they also have roomy coops.