So, I propose:
reduce install time
reduce image size
reduce compose time
The areas where hundreds of installations are performed from an image are
hardly the common case, and those installations should really consider
composing their own images with exactly the package set that they need
(including site packages that Fedora cannot ship), images which they can
then compress with a faster-to-decompress algorithm. I think that we should
optimize for the standard user who installs exactly once.
And finally, those few percent can make the difference between fitting on a
given fixed-size physical media or not. The original change proposal of
trying to minimize the size might actually make at least the smaller spins
fit on a DVD again.