Why is D unpopular?

[Sergey]

On Sunday, 12 June 2022 at 01:03:06 UTC, forkit wrote:
> My argument could not be simpler:
>
> Compiler. please enforce the invariants of my class at compile 
> time, if that's what I ask you to do (with, for example, 'scope 
> private int x';
>
> It's a really, really, really, really, simple proposition.

Why not prepare well written DIP with examples from other 
languages and to ask some experienced core developer to have a 
look at it?