I appreciate that some people are taking against flagging as well.
I think it's especially disheartening when you've worked on a game in an artistic way and it gets destroyed, and the opponent isn't working to progress their own position, simply to win on time. It also effects your later performance, because it's hard to put in that same level of effort into following games, and then you tilt.
Getting flagged means your opponent played smarter than you did.