I don't know why FFG didn't think of this prior to Regionals???
Hard to say, but keep in mind that it's not like it's an easy change to make. The number of potential places things could slow down is large: design team, organized play people, marketing people, potentially even localization people, etc.
I think I like the "new" tie-breaker.
Also, there is, nor was, not such a thing as a "Modified Loss". There is/was only wins, modified win, loss, and draw.
That is somewhat pedantic. A loss where your opponent had a "modified win" was 0 points, and 3 points for SoS. A loss where your opponent received a "win" was 0 points and 5 points for SoS. So the two were not the same thing, regardless of terminology, and a "modified loss" not only existed but it penalized a player for having a close fought defeat.
The new system avoids this, and avoids other even more arbitrary penalties.
It doesn't make up for the loss, but it does mean that a losing a very close game doesn't create a disadvantage for you relative to someone who got tabled--meaning it fixes one of my many issues with SOS.