I'm seeing a serious flaw

The only really Ubuntu-specific things I noticed was the integration into
Launchpad and PPA's... both of which do not really have a equivalent in other
distributions. Sure you have bug track and things like that, but PPA allows
people to setup their own personal repositories easily and have other people
use them. I can't really see that as anything but a nice feature.

Otherwise everything else seems to be distro agnostic, except you'd have to
replace debs with rpms, but that should not be a big deal.