[Autumn]

None of this seems to give the user of CS a mechanical advantage. it still ends your turn in a random tile of the placement then the rest is history. Why do we not talk about opponents and the bugs out there at their behest in order to detect where someone is under a shade instead? Because as far as I know, those are undetectable as well.

As far as I can recall, all of the methods I listed above are only visible to the user in question, as when tested on the opponent's side, debug-battle-tile, trade request and resizing your game window won't reveal create shades to you. 

If you can think of any methods in which to replicate being able to tell where an opponent's create shade is, you're free to make a bug report on it as well.