> There's a ton of things I like about Rust but the points he outlined above are things that I've seen very much impede the adoption of Rust into some environments that have similar restrictions(no download on build, build from source without binaries) for security and reproducibility reasons.

They're all on the roadmap for the very near future, because Servo (and Rust-in-Gecko) needs them. There's nothing in the design of Cargo that prevents these from being solved.

Personally, I love Cargo. Autoconf is miserable and I would hate to go back to it.