Why are some types from std not in the core of the language?

[zjh]

On Sunday, 12 June 2022 at 14:46:29 UTC, zjh wrote:

> Without `encapsulation`, the code is a `mess`.
>
> A bunch of `thousands of` lines of `code files`, how to 
> contribute?
> Why not split it into `dozens of` small files into hundreds 
> lines files?


We all know the story of `'VIM' and 'Nvim'`. What `'d'` needs is 
`'radical'` change, and `'DMD'` needs to be completely 
`reconstructed`!
At this time, it `makes sense` to completely `refactor` .
Keep `'D2'` for maintenance version `only`!
Only through `'thorough'` reconstruction can activat people's 
interest in participating in `'DMD'`!