I may have my facts wrong, but I thought Clemens or someone like him, is said to have gained like 5mph on his fastball after the age of 35... I get what you're saying about over throwing and so on though and I admit there is a finesse component (Greg Maddox, for example). As to the hitters era (roids or no) I guess I don't see the issue there. baseball has a long history of Hitters or Pitchers eras.... They moved the mound up and down... they moved fences in and out... so on. We've seen a move to smaller parks since Camden was built, and I figure that has some to do with the power number increase... likewise, with expansion, less skilled pitchers were tossing balls to big hitters and thus giving up more hits and HRs. What would the effect been if there weren't roids too, I don't know... but.. I would think it's not strictly a roid issue.
Imagine Babe Ruth playing half his games in Colorado... lol