This idea mainly comes from the newly added second screen support. I mostly use Shadow on my iPad Pro w/keyboard, and have my iPhone docked vertically on the desk next to me. I’d love to be able to move a social media window (like Twitter or Reddit) over to it. My iPhone 12 mini is a bit too small to read anything in landscape mode.
Same goes for the iPad. When I don’t have it in my Magic Keyboard case, I’d like to be able to rotate it and have Windows automatically adjust. I don’t expect full tablet support (I’m sure that would have been done already if it were possible), but would be nice to have.