Why D is not popular enough?

[Patrick Schluter via Digitalmars-d]

On Sunday, 14 August 2016 at 18:03:24 UTC, Shachar Shemesh wrote:
>> 
>>> I must confess that I have never heard of this rule in C 
>>> before encountering it in D.
>> 
>> Which rule?
>
> The rule that says "ubyte + ubyte = uint".
>
https://www.google.fr/search?q=C+int+promotion+rules&ie=utf-8&oe=utf-8&client=firefox-b&gfe_rd=cr&ei=xaOxV5vuMpGx8weWtIawAw#q=c+int+promotion+rules+standard

This is so central to understanding the C language that I'm 
surprized here. There's no forum, FAQ that doesn't mention it.