The vast majority of all software tech ever invented is unpopular today. If we just pick a tech stack, language, editor, OS or anything from the last 70 years at random, it's almost certainly unpopular. That's our first-order effect that forms the bulk of the rational explanation for why anything is unpopular. By definition, not everything can be popular: popularity is the selection of a very small number of artifacts (almost always chronologically recent) to the exclusion of everything else.