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Never mind. I must've still been waking up.
I'm assuming the distinction you're referring to is that it's wrong to call a beta version a "testbed" for the release that will result from it?
I'm not really sure I agree, but I see your point.
(RHEL and Ubuntu aren't merely Fedora and Debian Unstable debugged, so one could argue that, from a certain perspective, they're testbeds. RHEL and Ubuntu let the Fedora and Debian Unstable guys act as guinea pigs and then take what they like.)