My opinion is just slightly different.
The Elbow clearance is relatively new, compared to the others.
I can guarantee you there are a lot of good, quality breeders that have dogs without elbow clearances, or at least had at one time.
Would I buy from a breeder that did Elbows if possible? Heck yes.
But, would I allow that one clearance to prevent me from buying a dog from a breeder with proven lines, where the parents and the rest of the line have proven themselves over time, stop me from buying a dog?
Probably not. As long as everything else is there and the line is well proven.
I'm on my fifth Golden, and none of them had parents with Elbow clearances on both sides. Gilmour does on his Pops side (Lycinan), but not his Mom's side (Pebwin).
I've never owned a dog with elbow issues.
But like I said. It is very highly preferred, as others have stated. And any new lines should most definitely have them at this point.
But if the pup comes from older, well established and respected lines, with no history of issues in this regard, I would probably be willing to let it slide.