The thing is, people try to argue semantics using their own, subjective dictionaries. It's silly.
It's a colloquial term, created by us, the simming community, to distinguish between very complex and those less complex addons.
More or less, the general consensus can be made between the simmers of what is and what isn't a "study sim", but there will be obviously some differences here and there.
What I find crazy though, is that looking at some posts in this thread, NOTHING is a study sim, and nothing EVER will be. If you are looking for 1:1 simulation, then go ahead and pay $550/hr for a Boeing simulator and then you will have an actual experience.
PMGD is regarded as study sim by the majoriy of the community, and yet it's missing quite a lot of features of the real thing. Maybe some people should just accept it's a game, and that "study sim" means something different in PC simulation games than they think it means.
So tl;dr (as some people seem to get lost in posts): "Study sim" is a term colloquially used by specific community, which isn't to be taken literally. It has its own meaning given by that community. While everyone has right to their own opinion, arguing with semantics widely spread in the community is rather silly.
Cheers.