This question asks whether programming language tags such as [java], [c++], or [python] are on topic at CS stack exchange. The answer says that questions about the programming languages themselves may be on topic but questions about writing in those languages aren't.
That answer is 5 years old and while I agree with it in theory, looking at questions with those tags reveals a graveyard of programming questions that should not have been asked here (and generally are very low quality). The top questions tagged [java], [c++], and [python] are generally not specific to one particular language. In the few cases that they are, they would also be fine under more general tags like [programming-languages] or [type-theory] and the language-specific tag seems unnecessary. For each of these tags, the majority of questions have 0 or fewer votes and a large number have negative votes.
I posit that the presence of those tags gives newbies the impression that their programming questions are on topic here. Even if there are theoretically good questions for these tags, in practice these tags are magnets for bad questions. Given the data, do we really think these tags are a net positive for the site?