snowflake... TOV... please check your pm's!
As to the online safe words. For a long time I seldom used them and it entirely depends on the situation. If it is just a bit of harmless cyber fun then no not going to bother I would close the window.
But, if it is a Dom that I have made a commitment too serve to me closing the window on a scene that has gone too far would be like walking out the front door in the middle of scene and it totally unacceptable and would harm the overall relationship. So, I see them as necessary. I may be controlling the amounts, etc. but I have put myself into situations that ended up being harmful due to lack of foresight on both our parts and/or extenuating circumstances.
Goes back to whatever fits for each couple ....