hot take, language standards
Nothing should be standardized in your programming language or standard library unless it is absolutely critical for the functioning of the ecosystem
Because it doesn't matter what your deprecation policy is on paper, as soon as you declare something an official part of the language, it is set in stone until the heat death of the universe, due to the special status it conveys to users
You will be forever stuck with it, even if the design turns out totally broken
re: hot take, language standards
"But people want known-good libraries, instead of hunting for them!"
If you have functioning package management (which you should, it's 2023!), then you can literally just have external packages for those libraries that are published and officially sanctioned by your core devs
Now you get all the benefits of standard libraries with almost none of the downsides