Not to step on any toes here, but in SA it is WAY hotter then in europe.
It's the 'norm' here for Saint owners (as pets) is to shave the dogs. Just the tail and ears are left, and the finished 'product' look pretty much like a smooth Saint.
I was also told not to shave due to it ruining the coat if we are talking show dogs. So show dogs usually are not shaved.
However When I retired my two older bitches at 6 and 7 years, I had them shaved (due to the heat), and I cannot say that there was any differance once the coat grew back for winter time. Not at first, and not after 3 years with a seasonal shave once a year.