@cat@james @strudball made a suggestion in another thread which seems to have been overlooked and might help.
I think there is value in what both John and Ron suggest - it just needs some discipline and perhaps a tweak somewhere to persistently indicate the type of topic in view - perhaps in the topic banner - to serve as a reminder about the “rules” on that topic alone?
I’m sure people will co-operate if they know and understand the reasons behind it. It perhaps might also make managing the topic more transparent.