What exactly do you call a niche? Entire industries are being propped up using it. What happens is because the solvers are written in these things, engineers st

What exactly do you call a niche? Entire industries are being propped up using it. What happens is because the solvers are written in these things, engineers start building everything with matlab. I have personally made networking implementations, webservers, Apache Arrow clone etc. It's really not as niche as you think it is. For mostly worse, this language is everywhere.