Moving back to .NET

[Kagamin via Digitalmars-d]

On Thursday, 8 October 2015 at 10:59:04 UTC, Ola Fosheim Grøstad 
wrote:
> I think D could do well if it focused on engine-level system 
> programming and made sure it was absolutely top notch for that 
> purpose. (Game engines, search engines, ray tracing engines, in 
> memory database engines, business logic engines, etc).
>
> The current focus goes the other way. The current assumption is 
> that engines are written in C/C++ and they are used to complete 
> applications in D.

What D lacks in comparison to C w.r.t. to writing an engine?