CPU architectures are still most of the time communicated in terms of "x86" and "x64" as opposed to numbers of bits. I have an idea as to why this is, but I'm not entirely sure. I'd like to ask if there is a single answer or multiple possible answers, and if so, what it/they is/are.
Is this type of question on-topic for Super User? If not, what site would this be appropriate for?