I do agree with everything you said, but a) I'd still rather the giant than jupiter and b) Nim still has a long way to go to prove itself. Just like D, it is in the awkward position of being high performance without fully addressing either the performance or safety concerns of the preceding languages. This may be an acceptable tradeoff but neither have any killer features that make it an obvious good fit for a given problem. Rust has memory safety-like, actual memory safety-and go has utter simplicity. What is the Nim two word pitch? Small binaries isn't going to win anyone; that's what deflate is for. Meanwhile, you don't have the language stability and, erm, prudent design that D has hammered out for over a decade. Even if I don't agree with the decisions I can't say D has executed poorly.

Nim though? Who knows! I've never seen it in production, so I can't tell the downfalls!