Don't confuse what Google publish at the AOSP with what they ship on the Nexus/Pixel devices: they're increasingly different, with AOSP increasingly dysfunctional. Heck, the initial release of Android 7 for the 5X/6P at the AOSP wouldn't even compile because it had closed source compile-time dependencies.
And no, I really don't need anything that CM brings (I only switched from AOSP to CM because it was better supported on my tablet, CM actually had a developer while the AOSP guy was simply pulling the changes from the CM developer).