Post 20. I do not think that I can explain it better than that. 
But I’d like to explore it on occasion
You can try it, who said otherwise?
Personally, in unranked games where people might be playing for fun, when I try weird stuff like the Sideseki, I tend to notify the opponent that I am going to be “trying out some stuff, if they do not mind” and if they are not keen on that, we can cancel the game. I think that’s good manners, as far as I am concerned.
If the game is ranked, you do not have to inform the opponent at all. You can try a weird strategy in order to win, no problem.
That is your choice and right to do so, since it is in the rules.
All I am saying is that I’d probably give you those points in 20-30 moves if you play mirror Go on a ranked game against me.
That is my choice and right to do so, since it is in the rules.