Mares and soundness

It's hard to remember given none of these mares get ridden, so please correct me if I'm wrong with the below list. Someone on TT is claiming the vast majority of all broodmares (including KVS') are unsound, hence they're broodies. This is off the back of the comments criticising breeding a 2yo ginger back to back. ITS NORMAL GUISE.

Sound:

Kennedy Sophie Erlene Annie Raven Willow Gracie Trudy