@Sunlov
That's exactly it – to date nothing has been more effective to work, herd and manage sheep than dogs. Many have tried and at one point there was talk of drones potentially making working sheepdogs redundant but whilst they have the ability to move and generally manoeuvre a large number of sheep, there's still nothing that beats a dog.
Read an article years ago that said it would take the equivalent of three or four pro-athletes to do the work of one dog. The level of fitness, endurance, stamina and athletic ability to manage that amount of work over different terrain and in all weather conditions is unreal.
Robin is a really decent chap and fascinating to listen to and watch. He's a judge for the International sheepdog trials and has training kennels on his farm with a long waiting list of people paying a fair bit to have him train their dogs for work.
Think he's one of the typically old-fashioned farmers / handlers that on the outside comes over as a bit of a hard, cold and quite harsh sod but underneath a real soft-hearted soul you only see in little glimpses now and again.
When he talks about Roy you can feel and see him getting emotional talking with such genuine feeling 
My youngest was / is the most useless sheepdog that ever lived. Robin bought him for a pretty amount being the son and Grandson of world champions and tried to bring him on and get him going for work but when it's not there – it's not there.
He was reckoning to be all put out and pissed off at having lost money on this dog that wouldn't do a sodding thing but when we went to bring him home he had the same little flicker of emotion and sincerity in his voice saying “I'm glad he's going home with you... He's not a worker and he's no good to me but he's a lovely little lad and deserves a nice home”
Then a second later “Anyway go on beggar off you've already annoyed me having the one dog that is right up my street and taking another home that's cost me a bob already go sod off” 
Later found out from his wife Eileen they were offered more money from people on the agility circuit that wanted him but they turned them down in favour of him coming to us instead.
Remember when my daughter was at the farm asking what all the different voice commands and whistles were and Robin explained how his “thing” was running brace (two dogs at the same time on different sets of whistles)
He got two of his dogs, whistled and made some R2D2 type squeaks and whistles and off they went legging it flat out way off in the distance and he just carried on talking. My daughter was there “What.. your dogs have gone they ran like way off over that hill do you know they've gone?”
“Yeah course you watch in a minute... they go off, split up and one does a full perimeter run on the left, the other does the right to make sure there's no sheep stuck or come to grief and then they'll meet up and in a minute start bringing them back”
Minute later this enormous almost cloud like mass of white just appeared in the distance and carefully - almost elegantly stayed in a nice ball without any panic or chaos and these two little black dots at either side nudging them all the way down until Robin whistled again and that told them to bring them through into a large barn / side paddock.
Closest thing I've seen is the video of the LED sheepdog viral clip. The large sheep walking across the hills is what Robin's sheep looked like when the dogs were bringing them back it's incredible.