That's a good point. But from my limited experience it's very clunky to do, but maybe you have a suggestion?
Ideally I'd like to have the Browse tab open while also being able to see the Collection tab. That way I know for certain that I'm putting those images in the right collection. As it stands now, when you open the browse tab it always shows the path structure on the L side, and all the other criteria (collections, browse, filter, search) do the same for their respective tools. For me it's inconvenient to have to select with collection I want the images in, switch to the browse tab, select the images, hit command-B, repeat.
I did just try to have two windows open. One window had a Collections tab & one had the Browse tab. That did work. But still seems a little clunky.