THANK YOU!!! Marcel.
I installed this update immediately after it was released and I've already been using this new functionality yesterday and today, and it is as fantastic as I had hoped for
Here's a screenshot showing the entire phone screen filled with folders that have unread emails (and that isn't even all of them) nicely sorted at the top of the folder list ready to be read and actioned. Fantastic!
This is really great now! Woohoo