Why does Mac BIAB not include the ability to use RD and RT? Is it that different to program for Mac than for PC?

I guess if the discrepancy continues, Microsoft could use it in ads to counter Apple's "I'm a Mac" campaign:

PC: "I'm a Windows PC. I can make cool music with BIAB, using RealDrums and RealTracks".

Mac: "I also have BIAB, but cannot use those cool RT and RD, so my music doesn't sound as good.

(Play selections from both, to demonstrate the difference)

PC: "And you thought you were so cool!!"

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Actually though, if the problem with the Ultrapak on HDD has to do with the fact that the HDD is formatted NTFS, which cannot be read by Macs, nor by pre-XP windows OSes like 95, 98, and ME, I saw on the order page that Win 95, 98 users can special order the HDD formatted Fat32, which would work for those OSes, and Mac as well. So, I would guess that the HDD can be ordered in the format FAT32 for Mac.