I’m not sure where you learned this definition for ‘farm collie’ but it’s not one I’ve ever heard. Collies are hard to define but they’re more varied than you would think. Look up New Zealand Huntaways. They look nothing like border collies but can probably be classed as collies due to their ancestry and behavioural traits.
I don’t see why anyone would mix pedigree dogs with working dogs when there are plenty of working collies out there that have no trace of show dog in them. Collies have been used as working dogs for centuries and they still are in many places (UK, New Zealand, Australia for example). Some traditional types are only left as pedigree dogs (Old English Sheepdogs, Bearded Collies), Show dog breeds are basically an offshoot from the working dogs and at this point are really separate breeds. If someone wants a working dog why would they get a show dog / working dog mix which is likely to have poorer health and less working ability when they can just get a regular farm working dog? And if the point is that they want a traditional collie type as a pet, then I hope they realize how much work these dogs are and how much stimulation they need.
