I never heard about banning autocomplete as guideline, maybe they failed eventually and we forgot about them?

of course its their guideline, but guideline sounds more like fighting against progress.

Imagine these:

    * we ban cars in our farm
    * we ban autocomplete, because it makes you stupid
    * we ban airplanes, because its not normal for people to fly
    * we ban chemistry, because they feel like witches
    * we ban typography, because people can use it for propaganda against us

And all failed, so much that, we don't even know if they existed or not, but we definitely know this sound absurd now.