While the OP stressed one side of the story, I believe as 1Ks or 1Ps we all have the experience to purchase a last minute Y (or B E U M) fare and wish a couple of F/C seats were not given out yet. I do not blaim UA for saving them for the last minute. At least now the GAs are being directed by the computer system instead of making their own judgment, which makes me trust the upgrade system fairness a little more.