I think it's since the "No action needed" buttons were introduced, that there are no posts to review in the queues mentioned in the title.
I'm just wondering, why is that? Before that there was plenty to do.
Pretty clearly, the 'dribble' process has delivered all the old late answers that it is going to deliver. So all we see are new ones. And there seems to be quite a supply of us who watch the queues and respond. You are just unlucky.
Reviewing requires patience.
There is enough to review, but you need to monitor the queues often.