I think you're coming at this as the owner of a horse who is struggling with health/digestive issues, whereas many posters are coming at it from the financial, business side of things, and that's why there's no agreement happening.
It would be great if all yards could offer what you're asking for, it really would, but the reality is that to offer those services as standard (so that every single horse can access restricted grazing at any time they want, for example) would just not be possible. It's not just about cost, it's about time, staffing, equipment, land, planning permission - it's just not that easy.
Running a business has to be profitable at the end of the day. So if you provide facilities that increase the workload needed, you either need to work longer hours or hire someone to come in and do it for you. So it's generally easier not to offer it, or to tell owners "you can soak hay here, but you need to come down and do it yourself" which is fair enough, IMO.
The same goes for penned areas for restricted grazing - yard owners can't expected to be constantly available to move horses around depending on the requirements of multiple different people - so again, you have to hire staff to do that - which is why so many will say "if you need specialist care outside of our standard service, you need to come down and DIY".
I totally get your view that it would be so much easier if all this stuff was offered as standard and yard owners were on-hand to do whatever your horse needed, but practically and physically and financially, it's just very, very difficult to offer that.