I have nothing funny to say about this. This particular grift has already killed or permanently disabled, with agonizing pain, thousands of primates under sloppy conditions that would fit right in with Mengele.
I have deep, lasting hatred for these death cultists.
If you have a general idea of the temperament of the parents, you’ll have a better time. The issue is that a lot of a dog’s ‘personality’ is based on genetics, and while you can train it out of them if you start when they are puppies, but it can only do so much. Eg. If you breed an anxious or nervous breed of dog with an energetic and friendly breed dog, there is a good possibility that the puppies will have huge attachment anxiety and will rip up your house if you don’t have another dog around, something you could train them out of, but you would literally be fighting their genetics to do so.
Most dog breed owners prefer to train with the genetics of their dog, which can be easier with pure breeds. I say can be because there are a lot of weird things that can and do go on there. Long story short, mutts are usually fine if you have an idea of who the parents were and their temperaments, and can have time to train them. Otherwise it is a completely mixed bag.
Overall mutts have better tendencies towards physical health, but again, it can be a mixed bag.
The degree to which genetics influence behaviour at the individual dog level is very much overhyped - this is some decent research
https://www.science.org/doi/10.1126/science.abk0639
So you can see here that border collies on average take instruction much better than the average dog, but it’s very difficult to determine whether the bordie collie you get will be any good at taking instructions.
They also made a website with the data https://darwinsark.org/muttomics_viz_dashboard/