What are the prominent downsides of the D programming language?

[jmh530]

On Monday, 28 September 2020 at 18:12:16 UTC, mw wrote:
>  [snip]
>
> Well, if it's designed or implemented poorly in the language.
>
>
> https://forum.dlang.org/post/iajvjzaskzwlhcuztiiz@forum.dlang.org
>
> I think this deserved to be more widely known:
>
> The diamond problem is a *solved* problem by Eiffel language, 
> which won the 2006 ACM Software System Award:
>
> https://en.wikipedia.org/wiki/ACM_Software_System_Award
>
> And I showed the concrete example here:
>
> https://forum.dlang.org/thread/obqthozmxwzhvrafothw@forum.dlang.org

I remember that thread. It was interesting.