The trouble with those bad examples given is, if we are honest, we can find those every place, under any management.
Plenty of horses in the SW live outside 24/7, are only ridden in playdays or trail rides on the weekends, hard, when the owners get around to come to ride.
Those horses are out of shape, not legged up and fit to go spend the weekend competing or on the trail for hours, but that is how they live in the so perfect 24/7 pasture lives, where they in reality stand around most of the long days.
There is way more to how we manage our horses well, or that is lacking.
I put our riding center/s school horses that rarely had turnout at all, but were giving several lessons a day, being groomed and hand grazed and worked with, trail ridden, kept healthy and fit for the job they did, against so many private horses that are lucky to get maybe one hour some/many days a week, when the owner has time.
In the many years an uncountable many horses, we had ONE light colic, didn’t even need a vet.
It was so rare, we talked about colic for days afterwards.
When I came to the US, seems that colic is very prevalent.
Most stables of all kinds have colics happen every so often, in stalls, with turnout, 24/7 turnout, they all do.
Still have not figured why the difference.
Folks, it really is best not to be so sanguine and dismissive of those that do things differently than we do, just because they are different.
We may just not really know better, those being their horses, not ours.
When there is true abuse, there is no question no matter what you think, if in a stall or pasture.
If horses are doing fine, at least consider, "different strokes … " may just apply.
Given whatever conditions we have, what is important is to make it work for the horses, with the right management for those conditions and each individual horse, even if it is not how we would manage.