The basic game has not changed, just how you play it. Video has given the hitters a huge advantage DURING the game. They can go into the Clubhouse and watch their ABS and then
adjust. Pitchers usually have three sequences they can use to mix things up. After that, it's problematic for even the best pitchers to consistently get people out.
5 Innings get you thru the order 3 times. If a pitcher is EFFICIENT that third time can play out to the 7th. So unless you have a Halladay or Lee or Carpenter who can get people out the 4th time thru the lineup, you need to play the game so you are not at a disadvantage. Most pitchers today
are just NOT GOOD ENOUGH or effiecient enough to do that. So your pen is the answer.
Take Sonnastine. He is pretty good for 5 innings. He tends to meltdown in the 6th or when he has to face people for the 4th AB. He keeps you in the game up to that time. It is silly, to leave him
in just so he can go another inning. He is a 'soft tossers' relatively speaking, so you yank him
at the end of the 5th inning NO MATTER WHAT and replace him with a hard thrower, preferably a lefty, so the hitters need to adapt fast to both the change in speed and side. This way you can use Andy on 4 days rest or if you go with the normal 5 days, you have a fresh arm in August and September. The point is that as a starter, some days he will be really good and some days not, but he will eat 5 innings and most of the time the team will still be in the game.
Now I know you can play it differently. But it's my opinion of the best way to play today given the personnel available. There is no law that says you can't pitch an different pitcher every inning.
What you need to do is match the players you have with their skill sets and set that up so they give you the advantage. For example: Can Garza or Price start? Sure. Not a problem. But is that the most effective way to use them to WIN games and a playoff spot, given the rest of the pitchers we have available - I don't think so.
But, I could be wrong. Which is okay, since if I am, you can always put them back into the starter roles and try something else.
It seems, everyone thinks that what you do HAS to be writ in stone and never changed. If you are not winning, try something new, if it works keep doing it, if not try something else. But no matter what you do you have to take into consideration the personnel you have at hand.