As a GM of a dog daycare who has worked in the industry 20yrs I'm obviously a little biased and inclined not to agree with you. It's also a little offensive honestly to assume we just throw people out in the yard with no training at all. Yes, it may be stressful for some dogs and it's definitely not for all of them, but the % of dogs that enjoy it while they're there is much higher than the ones that don't.

On the other hand, I hate dog parks. If you think daycare employees don't know what they're doing, then it's another level when it's just regular people in a park. Plus the dynamic of having the owners there makes dogs act differently and they could try to be protective.

And it's fine those breeders don't recommend us to people purchasing dogs from them, because I personally recommend that people adopt dogs instead of purchasing them. There's plenty of great breeders obviously, but from my experiences the bad outnumber the good.