I don't particularly care. I have too many characters to play all four on the same account at a time anyway, plus it wouldn't have stopped me creating a 5th or 6th character on another account and spending money on them. I guess the "there are four classes so we should have four slots" argument is flawed if we did have four slots to begin with and people would still want more to try out all the jobs as well.
Besides, the freezing method was probably intended to cap your maximum character availability at three, so that people itching to try out another class have to fork out money to buy a Time Capsule.
+1 to SGI for how to make more profit.