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Oh my gosh, you rock the mike.
The issue is space. I DO have biology training, I HAVE done population ecology studies. There are certain things that drive all living things - food, shelter, sexually reproducing as far from their own genes as possible, and getting away from their own poop.
Give a living thing the opportunity to get away from his own poop and you've done 99% of your job. If you do that by building UP - as in a very elevated design; aren't cotes just cat condos for chickens? - fine. As long as the birds can get there. Obviously it's not a solution for silkies. But building OUT is not any less desirable OR any less enriching.
Never EVER seen a ground bird incubate eggs in a tree. Never seen or heard of one that regularly eats 4' off the ground. So those 8' nesting boxes or 4' feeding platforms are just as artificial as anything else; they're enrichment and birds have enough brain to respond to enrichment. But they're not the only way to enrich an environment or to provide enough space or to meet the bird's instinctive needs.
My chicken yard has hills, a stone wall, various surfaces including leaf litter, grass, stone, sand, mud, etc. Logs lay across it, there are small trees in it, and it's 50 x 100 for 20 birds. They are given dry food, wet food, baited water, clean water, and whole fruits and vegetables and meat daily. They roost as high as is comfortable for them to fly. I don't think I'd be giving them a better or more natural environment if I instead had a yard 20 x 20 x 100 feet tall.
Now clean coops - holy heck, yes, talk about clean coops. I get the GIANT squicks looking at half the ads for hatching eggs on this forum. "Deep litter" doesn't mean ankle deep in feces, people.
As an aside, when I was raising goats we could do a deep litter with hay, but shavings always failed. Hay would create almost a silage down below the top layer; it was wet and greeny-brown and smelled yeasty and got toasty warm. Helped everybody through the winter. Shavings got moldy and red and the ammonia was overwhelming. It got hot too, but you couldn't breathe and the mold was awful.
I'd be a lot more interested in/comfortable with trying out a deep litter with good grass hay, if it weren't obnoxiously expensive. As it is, I'm stuck with shavings that are removed regularly.