What I mean is: do Arch Linux developers use Arch Linux to develop Arch Linux? Do Ubuntu, Fedora, Debian, and others do the same? Or is it a case of “the cobbler’s children have no shoes”?
It seems obvious, but it may be more complicated than it appears.
Since creating a distro is mostly about packaging software, I assume they use their distro daily to make sure software doesn’t break.
Anecdotally, I’ve seen Ubuntu and Fedora maintainers publishing screenshots where you clearly see that they use the distro they work on.