Alrighty, point taken, but for political correctness how would you distinguish between Mac and other platforms? If it's not PC, what is it? It definitely can't be windows vs mac, the correct term should be windows vs OSX, debian vs OSX, and so on..
I guess I just don't observe it as 'HP' or 'Dell' should be the sole competitors against Apple, the same as HTC shouldn't be apple's only competitor, it's a combination of those on the same line, as in Samsung + HTC + Motorola, etc, droids vs iOS, just the same as it is to say Acer + Toshiba + Dell + HP etc vs Macs. Because like you said, it's a proprietary company and has its own line of software, just as Palm and RIM have theirs.
RIM was not just a, but the best seller back in the 2006-09's, but they confined themselves to their niche and thus caused them onto their deathbed. Apple is doing their own niche too right now with the iphone line, except on the flip side they're successful at it just as RIM was back then. Now what happens next?
Ironically, the whole computer situation is pretty similar to the phones. I guess it's a part of what makes apple, apple. See, the mac is pitted against all the variants, while the iphone is pitted against those variants in android too.