I get what your saying Ian,
For the beater who has no desire to trial or rough shoot ... they just want to work their dog because they enjoy it, then they might be better off training the dog to go beating as you say.
I had a problem myself, I trained my dog with the shooting books and DVD’s ... first day I took him beating, he stopped to flush a few times, but after several shots he wasn’t expecting to hunt on he was expecting to go retrieve that bird he just flushed... and wanted to run off ahead to go and find it!
Now I have no doubt this is from a combination of my ignorance of not expecting or seeing this issue, my poor training and my and the dogs lack of experience. However I am sure a lot of beaters have had similar issues.
If beaters were to train in a structured way that trained their dog to hunt close, flush, and then carry on, without ever retrieving a bird, 90% of them would be happy with that and could carry on going beating.
One of the best beaters on our small shoot had two cockers, his older one wouldn't ever pick a bird, would flush all day long though and stay under his control and he was very happy with that.
There are more and more people who are buying gundogs as pets or dipping their toes in gundog work. They buy their dogs and then want to bring them beating or picking up. A lot of them don’t shoot and have no interesting in shooting ... but beating works well...
The issue however can start when their average shooting dogs starts to get proclaimed as one of the best working spaniels around (because they wouldn’t know a good dog if it bit them on the bollocks) and start breeding it with all sorts.
I have seen some truly shocking dogs at tests and I have only been to a handful as a newcomer and always shocks me that their owner proclaims how brilliant they are and tells me how many litters they have sired or had when they can’t do the most simple of tasks!
This has truly put me off ever buying a “good working dog” as I wouldn’t trust anyone to give an honest appraisal ...
I will be the first to tell you my dog is shite

but if he starts hunting cover better I might tell him he’s average lol... he’s not going anywhere though as he’s a much loved family member.