Honestly the main value of BuildStream in my brain so far is that I can reasonably have all the sources for anything I could ever run on my system in one big folder to change and iterate on
Fixing something _anywhere_ in my stack, from the boot loader to the kernel to the shell to the browser can be done in one big swoop that turns into one or more upstreaming PRs
I wonder how Flatpaks could fit into this at some point. Would be neat to merge those two things in some way