And I don't call 25kHz rolled off. And CD's will only go up to 22kHz if you brick wall (brick wall low pass, not brick wall compression) them at that point, most will start rolling off earlier. 20kHz is a better number to quote when talking CD's, as that is where most are significantly rolled off. (And if you don't believe me, take some FFT's, yourself. While you're at it, look at the bass rolloff on most CD's -- it's atrocious -- I agree it's a mastering decision, but if you're going to criticize records for mastering decisions, then CD's can be criticized for their mastering decisions as well.)
The signal has to be completely gone by 22.05kHz, otherwise you get divide-down artifacts.