Why is D unpopular?

[Ola Fosheim Grøstad]

On Monday, 16 May 2022 at 08:33:08 UTC, Mike Parker wrote:
> breakage), but I suspect many D projects and libraries died off 
> because their creators moved on to other things before they got 
> their projects to the state they wanted.

But why did they move on?

People have different answers, some related to the evolution of D 
as we can see in this thread.