I know for a fact and from experience that minor adjustments to coilover kits on a car will not affect the alignment to the point were the driver will notice a huge difference and the tires will wear beyond belief. I know this because like I said, I've owned to previous cars where I was constantly changing the height. I not talking about dropping the car 3.5 inches then raising it back up to normal stock height. I'm talking about 4-5 turns on the perch, which translates to about a half an inch on both of my setups. Your making it sound as if it will throw the alignment completely out of whack, which not the case. Of course, it could be entirely coincedental that both of my cars remained fine after adjusting the height, but that is doubtful. I guess if you haven't seen what I'm talking about there is no way to convince you. You are right that it will "change" the alignment, but it certainly won't be a drastic change. At the most it would change you camber slightly.