Why is D unpopular?

[zjh]

On Saturday, 11 June 2022 at 11:32:52 UTC, zjh wrote:
> On Saturday, 11 June 2022 at 11:27:34 UTC, forkit wrote:
>
>>> The module is not a type. You design your solution using 
>>> types.
>
>
> `Defeat` them, I support `you`!


Back then, `AA` put forward the concept of `"small class"` and 
absolutely opposed `"large class"`.
But as a result, in `'d'`, `module` is the `encapsulation unit`?
What an irony!
Other languages have absorbed 'small classes' and developed 
'interfaces'.
And the `'d'` actually choose `module|file` as `encapsulation 
unit`?