I hope that once I’m done it’s a set it and forget it experience.
While that's possible, there are also so many things to entice one into adding more.
But that's still much more pleasant a blessing, making changes because of something you want, rather than because of something the developers did.
Though, as for "done"... many emacs users [especially those who got really infected with emacs] may tell you it's never done. ;)
It's plausible though.
Some say the default config is, for them, done.