I tried Rust very briefly, a couple times building some random projects. Each would download and build around 500 (!) dependencies. A few of them failed to build on my machine.

Another time I decided to try and get OpenGL running on Win32 with Rust in an evening. I failed to find a satisfying way (free of boilerplate and magic incantations) to do it. Probably interfacing with the system isn't that easy and/or you're supposed to use specific wrapper crates. Don't remember the details anymore, but it's definitely true that existing infrastructure has a lot of inertia. What Zig is doing in that space is a smart move - it has a C compiler built in, and if I understand correctly it lets you interface with C system headers pretty seamlessly.