There is no feedback without allowing discussion, every comment here has been attempting to stop the discussion.
I would like to have a discussion from either those who wanted the feature removed in FGU, or those who want the feature back as it was in FGU who used it in FGC.
Do you see any problems with it being optional in setup UI making it consistent with other Unity games that have real and faux full screen options in addition to desktop windows?
The known limitations of fullscreen in FGC still in FGU are your OS/GPU may not support fullscreen, fullscreen expands to all monitors, fullscreen alt-tab blocks task bar with removal of title bar so no theme interference.