I think that breed or type of sheep is irrelevant to the trimming feet debate
If you cull animals that need routine foot attention you will get rid of the problem
I have used this approach with Lleyns, Wiltshires and Exlanas with the same results =minimum foot care required
I recently went into terminal sire production with Charollais sheep and in the first batch of 34 ewes bought in I got rid of 2 in the first month for feet offences.
As a seller of stock I need to produce sheep that are fit for purpose, no ram buyer is going to come back to me if the stock he buys need treating for feet (or any other problem) all the time