ive had 2 from there 80s early 90s you make some good points. Also due to the scale of a breeding kennels time involved feeding /cleaning etc the pups wont have the socialisation a home bred litter would. Then as you say it was up to the new owner to understand this have patience and put the work in.My opinion on how a lurcher turns out is do your best and hope for the best. You cant put in what nature left out.