I'd be curious to learn how, exactly, Square Enix intend to prove intent in situations where a player silently leaves a group at any point. Even if it happens repeatedly, I can think of a number of reasons as to why it may be justified to suddenly drop a group that is in progress:

- The player in question has children who begin crying all of a sudden. Naturally, a good parent would immediately drop everything and go investigate the cause.
- The player in question is a volunteer firefighter or similar role that can be called to respond to a sudden emergency.
- The player in question has a spotty, unreliable internet connection.

That's just three examples, but I'm sure there are many more.