True. The funny thing about the CM ROMs for devices running a forked (sense, touchwiz, motoblur, LG, etc) version of Android is that by the time the ROM finally gets everything working and is starting to see some decent polish, bam, new android version drops, and CM moves on to the new AOSP. Most of the "drivers" carry over, but they still spin their wheels integrating all the new features.
This is only an issue if you are on a forked version of android though as the Nexus line has AOSP running smoothly nearly the minute it drops. P.S. my jelly bean stock keyboard autocorrected nexus to Jesus...
Therefore, if you want AOSP, or ROMs running smoothly on the latest Android software, you are MUCH better off with a Nexus phone/tablet than a forked OS. You lose a little of the glitz that the OEMs throw on their flagship models, and the ability to use a microSD, but the OS runs smooth as silk with everything working as it should.