Thanks for the review and the feedback! You're absolutely right that Tab Stash is a little different from other tab managers in that it's more focused on clearing away tabs and getting them into a place where they can be organized.

That said, there's an open feature request for showing tabs from all windows, and it's something I do want to implement eventually. If you're on GitHub, you can subscribe to it to be notified of new developments: https://github.com/josh-berry/tab-stash/issues/314