Imagine this: In the fourth quarter of a close football game, one of the referees realizes there was a pass interference missed in the first half, so it gets fixed retroactively. Or this: In the ninth inning of a baseball game, the umpire concludes that he failed to call a third strike earlier and makes a correction.
We get it. Golf is different from other sports. It plays by a set of rules that isn't analogous to those in which past decisions remain history.
However, that doesn't mean we can't question how and when such decisions are applied.