Just as someone who wants to see a more "middle ground" approach, let me take up for the "human element" a bit. It isn't that I want umpires to be able to do whatever they want and blow calls. When I say "human element," I simply mean preserving the ability to allow for different, legitimate definitions of what counts as a strike. Despite the detailed language around the strike zone in the rule book, there's always an element of uncertainty. The exact same pitch could be a strike to one batter and a ball to another. Pitchers want to get as many strikes in the extreme parts of the zone as possible. Hitters want the middle of the zone to be the only real place strikes are called. This makes the entire thing a negotiation. I think that's okay. I think it enriches the game. Even just watching, it's easy to notice my own aesthetic preferences emerging. Some strikes are ugly. They don't look like strikes (the 12-6 curveball that ends up in the dirt would be one example). Some are pretty (right on the outside edge at the knees). Having different philosophies about what's a good strike and what's an ugly strike can be useful and fun. That's a good part of baseball. I like high strikes, for example. Pitches up in the zone, even up to the letters, look like good pitches that a batter can reasonably hit. Somebody else might want the low pitch, right at the hollow of the knees, called more often. Debating those things is part of what makes baseball fun, and I think having some subjectivity within the strike zone allows for different styles and different ways to achieve success. Of course, there can be too much subjectivity. When zones are wildly inconsistent, that's a big problem. When pitches 3, 4 inches off the inside corner are strikes, that's unfair. That's why I'm a fan of the tennis style system. Allow for clear errors to be corrected. As fans, though, I think it's probably best to recognize that there are "borderline" pitches. The strike zone has gray areas. I'd rather live with some variance in the way different umps call those gray areas than institute one, machine-defined gray area that all of baseball lives by. To put it simply, I'm willing to live with umpires doing different things on very close pitches. I also hope technology can quickly, efficiently, and correctly eliminate obvious mistakes.