Comment by shadowgovt

Excellent write-up.

On the topic of rapid prototyping: most successful game engines I'm aware of hit this issue eventually. They eventually solve it by dividing into infrastructure (implemented in your low-level lanuage) and game-logic / application logic / scripting (implemented in something far more flexible and, usually, interpreted; I've seen Lua used for this, Python, JavaScript, and I think Unity's C# also fits this category?).

For any engine that would have used C++ instead, I can't think of a good reason to not use Rust, but most games with an engine aren't written in 100% C++.