Evolution comes at great cost though. Languages have to find ways to add new functionality while preserving backward compatibility. And the cost is great in human terms as well. Python added a walrus operator after so much fighting that Guido van Rossum decided to resign as BDFL. Meanwhile, OCaml doesn't even need an explicit new feature for that, because it's expression-oriented from day one.

Not to forget that when languages pile on features over the course of years, they effectively split their users into 'old-style' and 'new-style' codebases, where people need to worry about what features are usable with what versions of the language. It's a huge mess.

There is a very relevant detail many people forget when talking about programming languages, they are software products, no different than trying to sell a new version of a word processor or vector design application.

For some people Word 1.0 for MS-DOS is all they need, whereas others won't do without the latest set of Office 365 features, same applies to programming languages, as per application architecture, software design tooling and deployment scenarios.