Release parties and codenames were just examples. It's about the buzz
around releases. You can check Google Trends where you find peaks in
number of searches for Fedora after every release. Or fp.org monthly
stats. You would lose reviews, that are usually published after
releases, because I don't see any reviews of rolling release
distributions by main magazines. Etc.
BTW this is not just about current Fedora users. Marketing is mainly
about potential users.
Well, as someone has already said here: stability and reliability are
relative terms. I used Arch Linux for a while and I didn't find it
stable and reliable on the level where I'd like to see Fedora. If you
have to read release notes before every update to make sure you know
what might break and how to fix it, then you're not using a system that
would be appealing to a large number of user. And Fedora has always been
aiming much broader audience than Gentoo or Arch.