If I understand this correctly, Butterland is proposing a system where there is time given between moves to help those who do not have the time to set down and enjoy a game. However, once they settle down and play the move, they are forced to make the move within a time limit.
For example, say a player can have 5 days between moves. This means that he can have up to 5 days before he moves, allowing him to plan out his events if he is too busy. But once he has the time to settle down and play, there is another clock that limits the amount of time he has to move. Say one hour per game. If he takes 5 minutes to make a move, he has 55 minutes left in the game, but 5 days until he must make a move.
Not sure if this is what he means, but it would be an interesting system.
I agree with the point that the time constraints are there for a reason and you are allowed to fully take advantage of that.
that being said -- Butterland, I will admit, however, that I do notice myself really "grinding" when I am in a losing position. I guess that is just my competitive nature -- I hate to lose at ANYTHING. If there is a way for me to still salvage a draw etc., I will try my best to find it. I agree with your observation that players may do this towards the end of a game they are losing -- because I do it myself.