A friend and I regularly hire from a couple of locations.
One has very specific written minima for SFH published in the clubroom, the other has a more relaxed approach based upon the advice of the FI/CFI present.
My friend and I have discussed the pro's and con's of these approaches on various occasion and feel that there is "no right answer".
Agree that it's up to the owner/school to call their minima - they have aircraft, insurance and reputation at stake.
But I'd be very unhappy to turn up and find that they had declared poor wx and gone home without contacting me - terrible customer service
RC.