It isn't, though? Unlike the other packaging formats, it actually works across distros and independent of system setups, so if you choose it, you aren't limited to a specific distro or group of distros like the other packaging formats. Therefore, if you choose it, you don't have to deal with any further fragmentation of the Linux desktop. So yes, while you are "technically" correct, which is the best kind of correct, you're practically speaking quite wrong. It may technically be just another packaging format, but unlike the other ones, it completely removes the need to worry about fragmentation entirely if you adopt it, whereas if you use a bass script, various system configurations will conflict with it, and if you use a discropackage, then you'll keep helping to make new packages for various discros.