that was exactly my POV when I did my last instructor renewal.
SLMG, TMG and all the other "things"
thankfully I only did a couple of NPL's and the rest were all normal JAR PPL's.
its no wonder your normal private pilot is somewhat confused with all the different license and rating types. I don't have a clue either just know I have an ATPL with a SEP and IMC (although that going to be something different.) and a couple of multicrew IR's types.
Seems to be the further away you are from ATPL the more confusing it gets.
Good job there isn't an exam in the FIC and instructor renewal about all the different flavours available. Their would be an instructor shortage pretty quick.