I really think that more hitters and hitting coaches are having the Mickey Mantle approach to hitting ehich says, "Always swing for the fences!".
Secondly, I think oitching velocity makes a huge difference. "The faster they come in the faster they go out." I also think pitchers, especially short inning and closers throw 95+ mph. (Crazy just to think about) But these pitchers usually dont care much about pitch location. Its the old "blow it right by them approach."
These are my thoughts on the homerun topic!