The mass-moderator-closing of list questions was done for several reasons:
- These questions were easily collected, based on tags (set by the community, not by moderators).
- List questions tend to gather more and more answers over time, so closing makes a difference.
- List questions are easy to identify unambiguously.
None of these reasons apply to too-basic questions.
Furthermore, I don't think your example is that basic. Sure, Wikipedia has an answer, but I don't find the Butlerian Jihad article completely satisfactory, for example it doesn't explain why computers didn't survive in a splinter group and eventually reappear (yes, I guess the answer is author fiat).