I don't understand why comments on Part 1 were not addressed.
It's trivial to run "unstable" packages on a "stable" Debian system, and get the same effect as running up-to-date ports on a BSD. (Not much of the "stable" library packages would remain untouched, of course, but that's all automatic.) It's a touch less easy, but still hardly more trouble than the equivalent using BSD ports, to use apt to build and install current releases of packages from testing or unstable against stable-version libraries.
In practice, most of us just run some snapshot of unstable on our desktop machines, occasionally updating the packages under more active development. It has been years since any significant problem arose, for me. Since server environments are much less complicated than desktops, it must be mainly superstition that keeps Debian "testing" off of most servers. Certainly anybody willing to run Fedora has nothing to fear from "testing".
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