tmux can open new panes (or windows) in the current window's current working directory.

So when running gdu inside tmux (and gdu keeping its cwd in sync with what is shown, and fail silently if impossible) then tmux would be able to open a new pane there. That would be a more powerful alternative to suspending gdu (as the user would have access to both).

While there wouldn't be a noticable difference when not using gdu inside tmux.