I think that, because a topic can only appear in one category, this proposed use of “category” is not viable. There are too many reasonable and possible ways of categorizing topics and “location” is only one of them - and not the one that Purism has already chosen to use (“product”).
Undoubtedly this will be an ongoing problem in respect of the Librem 5, since so much about mobile services is specific to a region. What carrier works? What modem should I get? What features work? What bands work?
I would say that this information may be better presented in a Wiki.