To be fair there is nothing wrong with either system, it’s whatever works for you. I just gave a fairly standard approach to weaning off ad lib milk, though most farmers wouldn’t have lambs out in the field whilst on a milk feeder. With the price of milk powder, I don’t want lambs on milk any longer than they need to be, and they do perfectly well on a commercial rearing system (milk, wean at 5-6 weeks, creep for a few weeks in a large pen), then go out to join the rest of the flock on just grass once they’re a few months old. They all go fat, by the autumn. I try to keep any potential breeding ewe lambs out of the pet pen. Still an easy to handle flock though, anything excessively wild tends to go cull. That’s just what works for me though.