I'll use my imagination for the analogy.
I hear you on the HT thing, but you might have inadvertently painted with a little bit too broad a brush. I have a friend with a 3YO (I think) who this year has passed the Grand and the Master National. My friend started his own business right before he got the dog (do the math) and is in a situation that if he's not working he's not eating and making mortgage payments. If it were up to him to train or handle himself, he couldn't do it. He had a hard time making it to see his dog run in the Master National when it was less than an hour from his house.
The choice here was either let a pro train and handle or let the dog lay on the couch and waste all that potential. And I can't believe that it is all that uncommon. I don't even
have kids, and it is still very difficult to find time, especially at this time of year, to train, much less to figure out how to get better as a trainer with a wife and a job.
Sometimes people do things out of necessity to help a dog reach their potential.