Why is D unpopular, redux.

[Guillaume Piolat]

There is also research about language adoption, and quoting 
https://dl.acm.org/doi/10.1145/2509136.2509515

>  Second, intrinsic features have only secondary importance in 
> adoption. **Open source libraries, existing code, and 
> experience strongly influence developers when selecting a 
> language for a project. Language features such as performance, 
> reliability, and simple semantics do not.** Third, developers 
> will steadily learn and forget languages. The overall number of 
> languages developers are familiar with is independent of age. 
> Finally, when considering intrinsic aspects of languages, 
> developers prioritize expressivity over correctness.