Used to have Shetlands & Shetland Cheviots. Great mother’s, terrible to round up, keep in!I lambed ShetlandXCheviots and Shetlands and I've yet to have an easier time doing an outdoor lambing.
The dropped Texel and Beltex/Texel lambs and stuck to them like glue.
I don't doubt that some will have bred with no selection and ruined some hobby flocks, just like has happened with Highland cattle.
But if anyone is bothered enough to do their homework there are populations of Shetlands that haven't been ruined by smallholders.