Let me start by saying this, any time you do front end work, getting the alignment checked immediately afterwards is a good idea. That being said, on this particular truck, nothing you replaced should have changed the angles at all.
Looking at the printout, like with most alignments, the only thing they may have adjusted was the toe, and that was just to center the steering wheel. Camber and caster are both within spec, before and after, although I don't know why there isn't a before reading on the right side camber.
Because I don't know what your knowledge is as far as alignments go, I will attempt to explain a few things just to clear up any confusion:
-Caster: looking at the front wheels as if you're standing on the hood, caster is the angle of the wheels as they sit in front of or behind the axis point. If the wheels are in front of the axis point, that's positive caster. if they're sitting behind the axis point, that's negative caster. Caster has more to do with straight line driving stability and steering wheel return than anything else, and it will only affect tire wear indirectly as it correlates to a positive camber setting, and usually only on the outside edge. As far as having a tech customize the settings based on your driving habits, really the only application I can see that being a factor in, is circle track racing, and that's because all you do is turn left, and it would be advantageous to give the left side less positive caster to make the car want to naturally go that way.
-Camber: Looking at the front wheels, camber is the angle at which the tires lean in or out at the top. Outward would be positive camber and inward would be negative camber. This is the angle that has the most effect on pull left or right. Most manufacturers specs will have the left side set more positive than the right, and that has to do with adjusting for the crown of the road. Because of the crown, vehicles will tend to pull to the right, and that's the reason for the positive compensation on the left. Camber will wear the tire edges depending on how far positive or how far negative.
-Toe: looking at the front wheels as if you're standing on the hood, toe is the angle that the front edge of the tires point as compared to the back edge, left or right. Tires that point in would be positive toe (toe in). Tires that point out would be negative toe (toe out). Toe angles that are off will have the biggest effect on tire wear, causing a feathered edge depending on which direction they're pointing. When the tires aren't pointing straight, you're basically dragging the tires sideways causing that type of wear. As long as the distance between the front edge of the tire and the back edge of the tire are the same, it shouldn't cause any excess wear on the tire edge. This can however have an effect on the steering wheel being centered because of the way the wheels are pointed.
-Thrust angle: This is simply aligning the front wheels to the rear wheels. There are some extreme cases where you will see a truck going down the road almost at an angle as opposed to tracking straight. If the rear axle somehow got jarred and made to point one way or the other slightly, you would match the front wheels to that same angle. This could be due to a bent frame or something like that, and instead of fixing what's actually broken, they just make the adjustment up front to minimize the tire wear.