The theory would be that you can't have any more than one "thing I have started doing, and will resume doing first thing in the morning" which should be the mea

The theory would be that you can't have any more than one "thing I have started doing, and will resume doing first thing in the morning" which should be the meaning conveyed by "in progress" and everything else should be yet-untouched "backlog" or in a priority queue "prioritized" and therefore out-of-mind, or explicitly marked "blocked" with a comment about who or what is blocking it -- so that there's no question about why things aren't getting done or who is working on what (if everything on the board is sitting as "in progress") so people aren't over loaded, haven't bitten off more than they can chew, or have a bunch of things blocked but haven't raised their hand and spoken up about any of them (the typical dysfunctions).