On resizing the Emacs window, other workgroups resize it back.

I can't imagine this is the target functionality.

I use the same emacs fullscreen on remote desktop which has a smaller screen, and then at the desktop (where I can use the full screen) and everytime I have to resize the window once per workgroup.

I see wg-restore-position exists. Why no wg-restore-size, so I can set it to nil?
