I'm not really qualified to judge what is the right feature set for a build system like dub or cargo.

Sadly, D has its own set of problems and design flaws. It's better than C++ in many ways, but still far from Rust in terms of solid foundation in computer science and language design. Frankly, I see no point in integrating it with Rust.

And what do you mean by Rust being weakest in these categories anyway, and why do you think it is? What are "string-first apps"? And how is not adopting inheritance-based OOP a weakness? I think, many experienced programmers, especially those familiar with ML family of languages and otherwise well-versed in different paradigms, will argue that this particular flavour of OOP is more harmful than helpful.