Proposal: create two required tag categories: space and time. Every question must have a tag specifying the location and time period.
- If a question lacks a time tag, it is automatically tagged whole-history.
- If a question lacks a space tag, it is automatically tagged universe.
Pro: for many questions the first comment (sometimes accompanied by a downvote and/or close vote) asks for a specific time period or region. Mandating these tags may force authors to at least consider restricting the scope.
Contra: this increases a barrier to entry for new users.