In the Node & JavaScript ecosystem, there is the web framework Express. The current major version 4.x.x branch is over 10 years old [1]. And yet it powers so many apps in the ecosystem (over 17M downloads every week [2]). It lacks some features and is not the most performant [3]. But me and coworkers I talked with, like it because it allows for quick, stable development and long-term planning without worrying about drastic API changes and lack of security patches for older versions. Even better stability is provided with Go where we can run over 10-year-old programs thanks to a mix of wide stdlib and the promise of compatibility. [4]
[1] https://www.npmjs.com/package/express?activeTab=versions
[2] https://www.npmjs.com/package/express