I think there are some lovely cross breeds but I have yet to come across many owners on here who can:
a) call out specifically what they wanted from a cross. They will talk about researching the breed and finding it the best fit for their family but, when questioned, cannot correctly and appropriately call out the characteristic they wanted that was not there in either of the parental breeds. For example, they will say they wanted the coat of the poodle but cannot identify what the cocker brings to the mix. They will say they wanted a calm dog but neither poodles or cockers are especially calm. In many cases (but not all), they are unaware of the random nature of the genetics and inheritance of traits that results in a low % chance of the puppy actually having the trait they wanted from one of the parents.
b) name a good breeder of crosses. I might have seen something like a dozen breeders named on mn as shining examples of good cross breeders but on visiting their website it has been obvious within seconds that I would rather spend the rest of my days without a dog that buy from them. Some of the websites have given me great cause for concern and, on two occasions, those breeders have turned up in the press within months having been shut down for cruelty. If these ethical and brilliant cross breeders exists, they are never named. I have only ever heard of 2 or 3 good cross breeders - outside mn - that are doing it for the health of the dogs, and they are not breeding popular crosses. They are attempting to remove health defects from bulldogs, Dalmatians and Dobermans.
Multiple pedigree breeds are indeed in a great deal of trouble. Some breeds are beyond saving and every single individual now born to those breeds is unhealthy and unfit to be used to produce the next generation. This is shameful. It is also the result of breeders (KC and all) that have bred dogs without proper attention to the science of it - because they didn't know or didn't care.
It should be used as the main reason for NOT to breed unless who are knowledgeable about genetics inheritance. It should serve as the warning it is, that shit things happen when unknowledgeable or unscrupulous people play games with dog's lives.
And yet it is used as to support hobby breeders. Some pedigree breeders are shit so why shouldn't Mrs Mable breed her Lab with next door's Dalmation? After all, she loves her lab and would love the puppies.
She is still doing the same harm as all those shit pedigree breeders that bred without any consideration for making the next generation of dogs markedly healthier than the last. We should be seeking increased health, not fluffier coats, bogglier eyes, shorter snouts, more bowed legs or whatever else.
I would support any breeder that is breeding for mental and physical health from a foundation of proper, scientific knowledge - no matter what breed they produced.
I would condemn any breeder not doing that - no matter what breed they produce.
Like pp, I would expect it to be easier to find breeders that fit into the first camp when looking for a pedigree than a cross. But would be (genuinely) delighted to be wrong.