its horses for courses at the end of the day,some dog will not suit some lads people are into different things some lads are just out and out digging lads others like to have quick bolt to the runners others just like to work the rock spots and will not do earth work, different dogs for different jobs as long as your happy with your own mutts what does it matter
now im not saying you should breed from junk thats a different thing altogether, but the above is only my opinion though