I really hate old school baseball thinking. JA Happ cruises through 7 innings, on just shy of 90 pitches. Conventional wisdom says to keep him in, he has another inning in him no problem. The numbers say that he's already been through the order a few times and pitchers start to fall off the planet the 4th time through a lineup. Every meaningful offensive metric skyrockets the 4th time through.
On the flip side of that, relievers perform far better when given bases empty situations...this makes a lot of sense intuitively. Pitchers are far more effective pitching out of the wind up. So if we know as a matter of statistical fact that pitchers struggle heavily the 4th time through the lineup, and we know that relief pitchers are significantly better with bases empty...why do we keep ****ing doing this, and allowing a collection of middle rotation guys get themselves into shitty situations and then get mad that the bullpen isn't bailing them out?