@MacStuff On a side note, Panther wasn't available for the Quad. Also, the difference in performance, and not just because of processors alone, between your G5 and the Quad G5 are simply without comparison. Naiw is right: it wasn't until much later when Intel Macs, in terms of hardware, started to really catch up to it (Quad). Incidentally, I believe Intel started shipping their spying and extremely-flawed (in terms of security exploits) IME (Intel Management Engine) starting with the Core 2 Duo, no? And while on the Duo (but not later) the IME could be hacked out, that'd also kill the ability to boot OS X (AFAIK), making any Intel Mac pointless in this regard, and the hardware, which is what would be left over, would also be useless, as there are far, FAR better x86 IME/PSP-free GNU+Linux boxes out there (using the ASUS KGPE-D16 motherboard).
But that misses all the points completely. One of the really awesome things about the Quad is its ability to still run Tiger (and Leopard), which, while awesome by itself, also contains Classic, giving us
native (although virtualized) support for an absurdly vast library of classic, juicy, "real" Mac OS software, all impossible on any Intel Mac, even though emulators exist (for which you don't even need a Mac in the first place. I have System 7.5.5 and Mac OS 8.1 on a PSP myself, even). And this is just one little example.
This isn't simply a thrill or however other oversimplified, belittling way in which you put it: Having native, non-virtualized OS 9 running on a G5, particularly the Quad, is an excellent move forward as far as pushing OS 9 usability and purposefulness goes.

You also are forgeting the end users, which includes, but does not limit to, the people that make it happen.
In your posts, you seemed to assume to know what it all is that is or could be attractive to make OS 9 on G5 possible for each and every one of us, and what is so awesome about having and using G5s in general, particularly in regard to the Quad, but, with all respect, and with all blunt and due honesty, you don't know. Don't assume your point-of-view to be so equally or even similarly applicable to others. (Just having another opinion, though, is obviously fine.)