Java and C# also offered similar capabilities when D appeared.
Granted on Java side it required sun.misc.Unsafe, JNI or Real-Time JSR, while on C# side, a mix of structs, SafeHandle, MarshalInterop, unsafe and eventually C++/CLI.
So while not as pleasant as D, the cost to drop those eco-systems wasn't worth the cost to switch, and now 10 years later those eco-systems have doubled down on improving the experience for low level coding.
This makes it quite hard to sell D to those potential users.
That's at least why I glossed over it.