Yes, the shift is using the spray chart to increase the likelihood that the hitter will hit into the shift. If it's a power hitter who feasts on pitches that are on the inner half, and the pitcher is throwing to the inner half to try to induce the hitter to ground the ball into the shift, but instead is giving up 400 foot bombs to RF, maybe it's better to not shift and have the strategy for pitching that guy be based on scouting hot and cold zones. More importantly, if a pitcher is taking a different approach with the shift behind him but he doesn't have the best control on the hill, I would argue that the pitcher is more likely to make a mistake pitching to the shift than he would be pitching just to the batter's weaknesses. If you're using the shift to emphasize your team's strengths and minimize their weaknesses, it's a great move.