Where I grew up in Wales most house holders on the common land had grazing rights. Not as many as hundreds, and most householders didn’t use them, so with this assumption the common land was grazed by about four/five people and then others had a few ponies or cattle or whatever. In much the same way as a fank in crofting, a date to round up sheep was agree and everyone would go and help. The ground was wet, there were no quads, it was all done on cobs or foot. I had a pony so was asked to help, they’d sometimes give me a dog and a name of a bit of common early in the morning and off we’d go. The sheep basically knew what they were doing. Just had to keep an eye out for stragglers, cunning ones hiding, carry small lambs and stop traffic.
Then they’d be sorted, occasionally some belonging to other people would be taken away, but mostly dealt with communally, just given the other people’s marks or whatever. It was the same with the common ponies, but only once a year and much harder. Now it’s broken up with fences, fewer sheep, quad bikes and little community about it.