Why do people do this kind of "well actually" thing? Yes you're correct but it has nothing to do with whether the degree itself is intended for that.
because its good to have people not be misled by absolute statements like this "No MS lasts 3-4 years" that are simply incorrect.
do you enjoy being a source of misinformation?
I mean, how common is a terminal master’s program in STEM fields?
I imagine there are departments where it’s more common to get a master’s by dropping out of the PhD program early than through any other path. Especially for people with a bachelor’s in the same field.