I respect Gentoo fine (have not tried Slack TBH); and a distribution can very well be compilation-based - but that doesn't mean that I have to sort things out manually. That's what packagers and distribution maintainers are for. Gobo seems to tell you that I need to do that work myself.
https://gobolinux.org/recipes.html
Might have been a good idea to just click on that, first?
FWIW, they used to have a very nice rootless install of their compile framework, allowing you to use gobolinux within your home dir, within another distro.
Not really. That is, they declare that I would need to be able to to build management/configuration manually. So, either the FAQ is incorrect, or the build-from-source manager doesn't really cover everything. If it's the former, then that's good to know, but I wouldn't assume that is the case.
Its a build-from-source system. Akin to ports, or emerge. Where they do the fetching of sources, compiling and installing of global symlinks for you.
No, it doesn't write your config files for you.