My concern would be that since Frenchies do not have a "job" persay, there won't be "working" breeders. I honestly would be surprised if there were Frenchie breeders out there who had structurally sound dogs with good temperaments who were health tested and not shown. However, my guess is that there are some people who breed for slightly less extreme features- but finding one with a tail? That is where I go... "what?"
Why would leaving a tail make you go "what?"? Just curious.
I know quite a few Silky Terrier breeders in the US who are now starting to leave tails. There's controversy regarding it and some animosity between breeders but some of these natural Silky's have done well in the ring.