[tialaramex]

Realistically your provided build tool won't be everything. Cargo is enough to build my toy projects and even some fair size software written mostly in Rust, but it's not enough to build Mozilla, or Linux, or Android, or other large systems with a bunch of Rust in them - including Rust's own compiler and standard library.

But, when you get big enough to where this sort of provided tool isn't enough, chances are tooling is now somebody's actual problem anyway, if you're a for-profit somebody's job is to look after the tooling, you can invest in learning a specialized tool or even writing one because that's a proportionate effort, it makes sense.