""This doesn't really hold true either, especially for pitchers. Pitchers in ST can walk to the mound with the goal of working on a new pitch in a game situation, or focusing on command of a single pitch in an appearance.""
While that might hold true for an established SP, whose spot in the rotation is guaranteed, most every other pitcher is out there trying to get outs. They know it counts for them, and they're pitching for their MLB lives. They know that if they blow a game or 2 sky-high, they might as well start packing for the trip to minor league camp.
Look at Danny Moskos. He hasn't looked particularly sharp this spring, and he's walked 5 in 9 innings. But, somehow, someway, he keeps getting outs. So, with 28 on the active roster, and only 3 more cuts to come day after tomorrow, Moskos is in Philly. And not just because he's left-handed. Because he's put up the numbers.