Some of this has been alluded to above but:
1) Speed is now a bigger asset. On the bases and running down OF balls
2) Power arms are a bigger asset. Both pitchers and fielders
3) Quick release throws are a bigger asset.
4) In our ballpark, due to increased distance behind HP, passed balls normally resulted in runners moving up at least one base.
5) Good catchers are a bigger asset. Being able to receive, block, and throw.
6) Hard for weak hitters to get the ball out of the infield