That's certainly true, buy I think it also makes it quite unsuited as a reference (except for people who are already familiar with the concepts and just need a quick reminder).

Wikipedia math articles are not useful to get a shallow understanding of a topic. On the contrary, it pulls you into a rabbit hole of dependent concepts just for you just to be able to understand the words in the article's summary.

From an actual reference, I'd expect that it gives a brief, self-contained description of the basic idea of a concept, without going too deep into specifics, possibly with a "see also". That's not what Wikipedia does.