It just bothers me that "master" branch is a misnomer. It's a hold over from CVS/SVN where there was actually a central authoritative branch. I'm not necessary saying the other reasons don't have merit, as well.
I feel master as in "master copy" is sort of problematic too. Git has no concept of "master" as a "master copy". All the clones and forks are the same fidelity as the original. It's a hold over from source control which did have an authoritative repo like SVN/CVS.
I think this is the only thing Nostr fixes. It has a lot of other issues, I feel which makes it difficult to scale. Like you can't block anyone, just mute. It's only the text that is distributed, media is still centralized, etc.. You cant stop someone from following you. Metadata about you gets leaked to the network like who you are muting. It doesn't work well if you use two different clients, like desktop and android.
I don't know about feeling like an adult, but I don't feel like a kid, that's for sure.