I reckon so, I think the board is maybe going to morph back to one big area because many people choose to post in chat and other subjects rather than, say, 'education' in case people have hidden education as a topic. In which case might there be a case for chat thread not being deleted after 90 days?
(Btw, I haven't done this, but I did post a childcare dilemma yesterday under nannies etc and then realised I couldn't see if because I'd hidden childcare as a topic!)