Here's my reasoning for a single "Revisited Thread"

A discussion about Han Solo's character arc takes place, focused on ESB:R. However, after discussing "I Love You" "I know" for two pages... we move into a discussion of Greedo shooting first and why that's wrong... but, should that conversation carry on for more than half a page... someone pops up (and... per forum rules, rightfully so) and says wrong thread for this discussion... Which means everyone involved in the discussion now has to switch threads to carry on a conversation. They then have to check back to the original thread to check the start of the conversation they were having, before popping back to the new thread to respond.... It makes things difficult.