I agree with most of what you say except the part about assuming everyone teaches basic stuff using marker training. Can you give a specific example of where Hillmann or Lardy uses a marker in their basics program? I have their DVDs and Lardy's articles, and I've not seen one word about markers. Marking yes, markers no.

I will say that in Hillmann's fetch DVD, he says "good" at the moment the dog gets the bumper in its mouth. That could be construed as a marker, if he's properly conditioned it as a marker beforehand. However, in his soft collar DVD, he says something to the effect that you pop a bit of food in the dog's mouth and say "good" while it's eating it. That's not how you condition a marker. The marker comes first, then the food. It's classical conditioning. The marker has to precede the reinforcement. If you say "good" after you feed the dog, that's backwards conditioning, and there's plenty of published research that shows that backwards conditioning doesn't work.
You're right that marker training isn't new, when all dog sports are considered, but the people that employ it seem to be in the minority in the retriever training community. At least that's been my experience. There's also a big difference between just using a marker and using a marker really effectively. Also, even if you use a marker, it's hardly the only tool in the toolbox...at least in mine. Markers are great tools for some behaviors at some points in the training of those behaviors. I love using markers with young pups because it clarifies communication and accelerates learning. But once the basics are in place, I find little use for markers unless it's teaching stupid pet tricks to give my pups a mental workout during the long nights of winter. We are all easily amused...