By "Class G is Class G" I simply mean that nobody controls who goes there, and everybody in there has an equal right to be there, anywhere, anytime.
So criticising somebody for not reading a notam about gliding activity (or perhaps reading it and disregarding it) is meaningless, because those gliders could just as easily be 50nm away from the notamed spot, and they are just as entitled to be there as in the original place.
Same with notams of military aircraft. You could meet these anywhere, anytime.
One may as well notam a flight by a PPL student, on the grounds that his cockpit workload will be higher so his lookout may be not as good. Actually I better not give people any ideas
Not everybody likes Class G. Some pilots prefer to fly in CAS, for the extra protection they get. But I think G is very valuable and makes flying very easy in the UK, and anyway it suits the UK "user pays" system because there is no guaranteed service provided, which saves NATS a load of money.