Indeed they do talk a lot of sense imo. In particular about keeping an eye on costs and having the right sheep to suit your plans. I live near both and have been able to visit their sheep and pick their brains. I have a small flock but work full time and on my rented land there are no buildings, the same principles apply just on a smaller scale.
I have learned to be less sentimental about the sheep and whilst I have my favourites, if they make life difficult (especially at lambing) then they will be culled, not something I relish but am aware it is the best for the flock and me in the long run.
I also have a local butcher who supplies my village shop with local meat and although he loves his rare breed pigs and chickens he often reminds me that if you are selling meat you need to make sure that it is what your customers want, not necessarily what you think they should have. Taking this on board with my pigs I have switched from pure rare breeds to rare breed crosses; the pigs still look as my customers like (spotty) but the meat also looks like they expect (not too much fat) and tastes better than the supermarket pork.