I have tags Important, Medium, and Low for priorities. I assign these to only some emails in my Inbox, emails I want to deal with today. If I order the emails by tag ascending, to get Important first, then all the emails that have no tag go before the first tag. To get all emails with no tags below the emails with tags, I have to order in descending order which puts my most Important emails at the bottom. I dont think this is good behaviour. I would expect all emails with no tags to not factor into a tag sorting order and therefore regardless if I sort ascending or descending, all emails without tags go under all emails with tags. OR if you really need to sort them, then emails without tags should go to the top when you sort tags in descending order.