I think UK pasture is too rich for many horses to be on 24/7. So they are restricted one way or another - track systems, muzzling, restricted turnout, whatever. Mine aren't in that category and have always been out 24/7 most of the year. I am reluctant to change that for same reason as OBC really. I like them to play, groom, graze, mooch around. So that's something I need to weigh up carefully. I'd love to sort out a track system but not sure what YO would think!
But if you don’t have rich pasture there would be no need to restrict? Ben is out on 20 acres of ex dairy farm grazing which is fertilised every year. It isn’t surprising that this contains too much sugar for him. If he were on different grazing than maybe 24/7 turnout would be possible for him.