True; though for a counterexample, may I introduce you to TeX? Over 4 decades, and still in wide use.
Sure, there's been maintenance over the years, one significant version update (TeX 3.0 in 1990) and an ever-evolving ecosystem around it, but the core engine has been incredibly stable.
Sure, there's been maintenance over the years, one significant version update (TeX 3.0 in 1990) and an ever-evolving ecosystem around it, but the core engine has been incredibly stable.