Some parts exist either for backwards compatibility with existing code or to serve very narrow use-cases and should be used sparingly or not at all in new devel

Some parts exist either for backwards compatibility with existing code or to serve very narrow use-cases and should be used sparingly or not at all in new development. There's also a ton of redundant libraries and language features, resulting in a lot of decisions being arbitrary choices between equivalents. Having the same decision made throughout the code makes everyone who has to read the code's life easier.