It's funny that you mention that your "mindmap" looks like a roadmap to create a new distro. In the process of making a distro myself (which I never accomplished btw), I wrote a package manager for myself (to track stuff installed with "make install"), which I now use on whatever distro I'm using, on top of the default package manager.

And in the end, I found that for the tools that I really use, I install them with that package manager (even when they're available in the repos, so that I can choose the version I install). And because of that, I know more precisely what tools I need, and why I need them.