Hello, I am just treating two of mine for bumblefoot - and having spent upwards of £200 on vet bills, I am very firmly with Skeksis.
I have a hard floor in the run and had a bench in there and my really heavy girl loved to perch on the arm. Well that was the first thing to go.
(Before the bumblefoot, I had realised the bench was a bit high so put several small pallets in front to provide gentle steps down, so they didn't need to jump. But if scared or excited they would always choose to crash down to the ground from the arm, so that didn't actually solve anything.)
In my case I think there were several contributory factors, not least that the worst affected hen is overweight. I am trying to address all the factors but there will be no perches until they are completely better and then I will put in some very low perches which will be purpose made and smoothed off, the correct width just like the ones in the coop. I have also put some turves down to make it springy underfoot and am amazed to find that they are still mostly intact a week later. I left in the wood shavings (which I had used to replace the wood chip, which I felt was a contributory factor too) so it looks a bit of a dog's dinner but at least it is gentle on their tootsies!
Over-cautious - well yes! I have been worried sick about the girls, worn to a frazzle looking after them, feeling horribly guilty about the mistakes I made and those vet bills were a bit of a shock coming from nowhere!
My coop is one of the Devon ones from Coops Direct, raised up a bit so they can get underneath, so the pitch is about 4ft off the ground, and I have a normal sized galvanised bin in the run with their feed in it. I notice my tiny lightweight girls are the only ones who regularly go on the coop, and only the smallest one uses the bin as a look out point. Now they are fully grown, the two mid-sized/mid-weight ones only go up on the coop if they get shut out in the evening by the auto door (but as I now leave the back door open until my night time check, so I haven't seen them on the roof for months) and my really heavy hen, who is most at risk, avoids going that high.
So from the point of view of the coop roof, perhaps if they can get up there, they can probably get down safely. Also, my feeling is that if they have to use their wings - as they would from a 4ft height - it is better than when it is just a bit too high, say 2 to 3 ft, and they jump without using their wings to soften the landing and land with a bump. That, of course, is just an amateur opinion based on what I have seen of my own.
Hope this is helpful. Sorry, bit long, the subject is very much on my mind!