Nope, which is why I suspect I would find that behaviour frustrating. Let’s pretend I never said it.
I think the new list as it exists makes sense, and I can use it how I would like (i.e. to catch up on everything that I’ve missed). My workflow just has a slight hitch, which is that I still have to open (and, presumably, close within 2 minutes) topics in which I am not interested, so that they get out of the way of the topics which do interest me.
The reason that I can use the list this way is because it isn’t “everything that is new in the last $TIMEPERIOD” but “everything that is new in the last $TIMEPERIOD that I haven’t yet opened”. I’d just like a way to mark a topic (or, once we have group operations, a set of topics) as “opened”, without having to open tabs and immediately close them.