Welcome! Glad to see some who have common seance.
In this case I would assume the extent of the damage was done because of the concrete floors, that said I agree - Stalling is a cruel and unusual punishment to any horse. (With the exception of medically requiring a stall, however a small paddock outside would be by far my choice of confinement)
My 22 year old QH mare would cripple right up if stalled even for 12 hours with 12 hour turnouts. Its un-natural. I do not care if your stalls are bedded with $100 bills and feather pillows offering fans, AC/Heat and automatic water tanks lined in gold. I do not care if the horse is a $500,000 show stallion or a $50 flea bitten pony A horse is a horse is a horse. Horses were meant to roam, they do not stall themselves in the wild. I cannot be convinced that any horse wants to be stalled. Its been trained to be stalled. A horse who has been stalled is fed in its stall. Its groomed, praised, loved, cared for, grained, fed and all other goodness in its stall, hence it thinks stall = "Let me in!" A brand new foal will not pop out of the womb thinking "Hmm, two acre pasture to play in and nibble on grass or a wooden box to stand around in.... WOODEN BOX! Yippie!"
Stalling instills bad behavior. It creates bored horses who paw, chew wood, crib, pace, weave and otherwise go out of there minds. Then people by candy lik it toys and busy balls in attempt to give the poor animal a piece of mind rather than -God forbid- Letting the horse out?!
Being confined in even a well vented barn causes respiratory issues. Your tack gets covered in dust, every thing in the barn is coated in the same wonderful dust and people choose to have the horse breath this every day for a period of time, then wonder why the barn yearly has the snots going around?
Has anyone noticed its the stalled horses who turn up lame after a good romp in the pasture? Read stories and pay attention the catch is "I was on my way to bring the horses in and I noticed Wildfire limping...."
If someone can give me a list of reasons why a horse should be kept in a box I could use the laugh....
I certainly don't believe that all horses should be stalled, period. But some should. And you seem to be suggesting that all horses should be in pasture.
I leave it up to my horses. I observe where they're healthier as well as happier- in a pasture 24/7 or in a stall with bedding and daily turnout with a buddy. My last horse, my pony, preferred pasture, so I let him live there. If he lived in a stall, he would be antsy and if kept there for a long time, would probably have developed stall vices.
My current horse, however, is much happier and healthier in a stall. He's around other horses, but they can't beat him up and take his food as was happening before I bought him (which caused him to be nervous and grossly underweight, as no one was doing anything about the problem)
When I put him in a stall, he became happier, less nervous, and definitely much healthier. He gets plenty of exercise and is very healthy.
Maybe- possibly he would do well if he could live only with other extremely timid horses, but this would be hard to achieve. Why bother? He does great where he is.
That's just my experience. Nothing is 100% either way.
People should just listen to their horses.