Here's a good reason not to play blitz:
My opponent was bent on giving stuff away for a couple of moves, and was playing too slow for a three minute game. I continued playing fast and failed to notice the threats after 18...Nd5
White to move
I played 19.Rxa7?? and was checkmated a dozen moves later.
T.T.M. Dan Dan Kokoro Hikareteku
1 hour ago