I suspect that making wheel alignment changes outside of OEM spec will have some other sort of negative.
The OEM setup, like any setup, will be to achieve a set of performance parameters (handling, comfort, tyre wear, turning, braking etc). As with all such things, you can't have your cake and eat it. If you fix one thing, you'll unfix something else.
Its probably more likely some suspension component that has a wide manufacture tolerance on it.
Not everyone gets sawtooth do they?