D sits in a weird place and that's probably why it's not widely adopted.
If I'm using C, it's probably because I'm doing something low level and garbage collector could be problematic there. If you are fine with complexity, C++ or Rust are better options. If you want a simple language, I'd suggest Zig.
On the other hand, if I don't want to deal with memory management, and still want fairly fast compiled language, I'd just go with Go. It has a much better ecosystem, because low level GC language is really mostly targeted at server components and Go excels there with implicit async everywhere.
The creators of the D made a big mistake. Instead of focusing on improving the GC, they focused on making it possible to avoid GC in D. The Go has shown that this strategy was wrong.
