My experience has been anything but positive in those systems. I spent ~3 hours trying to get build.gn to work for a "non-googler" config to build Chromium, gave up on it. Ditto Buck, hit some random dependency issue and would fail to run.

Honestly CMake gets a lot of hell but it's the only one I've seen work wide-scale. Short of a greenfield implementation (like say Rust's package manager) I don't think you'll do much better in C++.