So here is the breakdown of pitch types. Only pitch two is what I would consider a driveable ball. However, that's on a 1-0 count and Mauer will probably take that pitch more often than not, especially when coming from a lefty at 95 mph.
It isn't about "driving the ball" it's about getting the GD run in from 3rd base with nobody out. That means all you have to do is get a fly ball to the outfield. On a 1-0 count, hitters should be ready to jump all over a fastball that is elevated (thigh-belt high) and catches a fat part of the plate. Mauer isn't. Plain and simple. He's more worried about his OBP than driving in runs.
3 of those pitches early in the count are balls elevated enough to get the ball to the outfield (looking back to Trix's graph they are pitch 2, 3, and 4). Yes I realize pitch 3 isn't in the strikezone, but that is not important when your overriding goal is to drive in the run. Pitch 2 is a ball he should be able to hit 300 feet into right field for a sac fly, pitch 3 is a ball he should be able to turn on, especially with as much bat control as he has, and pitch 4 is a pitch that is damn near grooved for him--just over the knees on the outer half of the plate, right in his comfort zone for hitting the ball to left center.
IMO, and this is just based on what I've seen from Mauer, he's more worried about getting on base for the guys behind him than driving in the runners who are on for him. There's nothing wrong with the mentality of having a .425 OBP in general, but it is a bad mentality for a 3 hitter. 3-4-5 in the lineup are supposed to be your run producers--guys with HR power and the mentality that, even if it means hitting a sac fly, I'm making sure that run gets across the plate. Mauer's strategy at the plate seems to be "I want to be on first base for the guys behind me," which is fine for a guy batting in the leadoff spot or the 2-hole so the 3-4-5 guys can drive the ball and get him in.
Mauer doesn't have the run-producing mentality. He's more worried about hitting .330 with a .425 OBP than driving in 100 or scoring 100. It's frustrating because he has every single tool needed to become a 25 HR-100 RBI guy in the 3-hole. He just doesn't seem willing to break his "singles swing" and try to drive the ball to the gaps and over the fence. It would lower his batting average to the .290-.300 range most likely, and his OBP would probably drop to .390 (his eye is still as good as any in the game but with the more aggressive style comes swinging earlier in the count).
DX-it isn't about "swinging at everything" it's about changing your approach to align with the goal of driving in the run. In the 8th inning in a tie game your job is to get the go-ahead run in from third base. If you can do that by getting a hit, by all means do it. But Mauer had 2-3 pitches that were damn near perfect to get the ball to the outfield and get a sac fly. Earlier on in the game, he can risk trying to increase his batting average or OBP and work the count. Late in the game he has to get the run in.