Windows packaging isn't all it's cracked up to be. There is no standard package repository, the norm is just to distribute executables of various kinds, the process of building installers is not that simple...

"Starting deb after and if investing on rpm failed would have been much wiser" except that Debian developers already knew rpm didn't meet their needs.

But these arguments are always selectively applied to certain parties (e.g. Canonical) and not others (e.g. Red Hat).