I have never argued it’s easy to find people to do it. Just that there should be a minimum standard. You can’t expect anyone to judge the scientific excellence of someone if they do poor trials themselves. The vetters must be vetted themself, otherwise the poor methodology will continue to flourish. The next step could be to involve S4ME or others with similar expertise when creating the jury.
I might be overly optimistic, but I hope some of the better researchers would find some appeal in helping out a funder that really want’s to get things right, and where there is a real possibility of achieving it.
You have not said that, but your post implies, at least to a degree, that if WWTF had just tried harder they would have satisfied your demands. But you can't really know that. We all want "better" jury members, it's not a demand issue, but a supply issue first, in my experience.