C'est la vie. There are also a lot more home runs and the two pretty much cancel each other out in terms of runs scored.
If you go a major league game you can still expect to see an average of about 9 runs scored, and that's pretty much 'same as it ever was'.
The real culprit in some of these changes is undoubtedly all the defensive shifts that encourage players to just swing for the fences. Launch angle, baby!