I dont think many people do read NOTAMS and that includes instructors. Maybe it is because very few people understand all the abbreviations. As Instructors may not have been trained to read NOTAMS they may not feel comfortable trying to teach a PPL student how to read them which leaves contientious pilots to teach themselves.
I really hope this isn't true. It's not like the rest of the aviation world would get a clear English award - we all have to learn to understand TAFs & METARs (and we all read those before flight... don't we?), V_speeds in the POH and all sorts of abbreviations for Nav. There is just no excuse for not being bothered to read the NOTAMs or not understanding them. If it's a bit opaque, and some certainly are, then ask!
Maybe many people can get away with it for a long time without anything going wrong, but if one day you go bust a TRA because you don't know it is there then you deserve everything you get.
As for Instructors, if they cannot understand NOTAMs and explain them then they shouldn't be instructing!