These are important, maybe most important, but software exists in an ecosystem. We still use some ASPX with .NET Framework at work and it's old tech but reliable - however, the world is moving on and it's becoming difficult to start new projects in it, not to mention end of life for patching and so on.
Likewise, at a prior role we used Perl and a lot of interfacing was made difficult by the fact that no one bothered making modules for Perl anymore. So while we can file these under easy to change, sometimes the world moves on without you and you have to think about the new shiny thing whether you want to or not. I personally started using Python at home not for any love of the language, but because everyone wrote modules and API examples for it.