I don't buy it.
Plenty of people have been driving for years and years and drive big, nice looking and expensive cars that are very clean and well maintained. . . . . and they are still crap drivers.
These days many many farms operate at a loss, without the subsidies they receive. Therefore, their livestock enterprise is often in no way efficient or successful in its own right, and their sheep are average at best. A lot of times they have been farming that farm for a long long time, because it was bought for very little generations ago, by a relative that really WAS good at their game. The current generation is often living on subs, borrowings and accrued capital.
Obviously if they are running a top quality flock, then they may well be very good at what they do. But some 'top quality' flocks (as shown by their high selling pedigree rams for example) are also fairly average at best. . . . . .
Maybe i'm being harsh. But just because the neighbours who have been farming for years are doing it, doesn't mean its the best way. If it was, most of us would have mules, or texel/mules.