I'm far from being an expert in these matters, and I wouldn't interfere with what others do with their dogs, but as I said, I grew up with Springer Spaniels and we have many friends with a variety of breeds of dogs and I have never before heard of crates or crate traning.
Bertie was fine being confined in the kitchen with the baby gate for the first year of his life, and he hasn't needed any kind of confinement since then, and I don't think I have ever spoken to anyone who has needed to confine any puppy or adult dog in a cage. The idea of keeping a dog in a cage for any length of time, particularly for a long time, is not an attractive one to me, nor is it something I have ever found it necessary to do.
I would never presume to tell anyone else how they should best care for their dogs, but I cannot agree that these crates are a good thing.