Research states that the best way to get a healthy puppy is to go to a breeder with a litter on the ground. Anyone have experiences with this? Good? Bad?

So I've been doing some research and the best way to get rid of the likelihood of inherited health issues is to go to a breeder with a litter on the ground. The research states that this is the best way because you can get a good idea of what the puppy will look like at maturity, you can interact with the parents and get a sense of their temperament and the breeder is on the hook to prove that the puppy will not be prone to inherited health issues. This all makes sense to me.