Exactly.
Apple does this all the time and it's understandable. Newer features are withheld from older devices all the time.
The ability to yellow shift the white point on a lcd screen has been around for more than a decade for the mac. Long before 64 bit.
Keeping a new feature away from older hardware is Apple's right. It's not like they can publicly admit they're deprecating old gear intentionally.
Remember, Phil Schiller saying that there are such and such millions of old PCs in use and that's just sad.
Sad for who? The computer manufacturers. Not us.