I believe if you add up the results the vast majority of the players who won the match would have won more games since they introduced the 3 set.I agree definitely no shoot out. I guess I could get with the concept if it was longer races. I just think the short races can make a lower player win. I was actually in a tournament playing this format and I went quite far but was way below the class of the field and would t have got anywhere in races to 9
If someone won by the first two sets then they clearly won a race to 8. If it goes to three sets without a shootout there is only one combination that I can come up with where the loser would win more games; 4-3 loss, 0-4 win and 4-2 loss; here the winner (shown first) wins 8 games and the loser wins 9 games, which I believe would be a low probability of occurring...the math guys can calculate the probability.
If it goes to a shootout then it is possible for the winner to win 8 games (if you check the shootout as 1 game) and the loser to win 10, which would suck but the probability of this happening might also be low. Here it would be 4-3 loss, 0-4 win, 3-3 tie and lose shootout.
Maybe there might be a flaw in my thinking, but this is my thought when I saw your post.