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Car headlights and glasses aren't telescopes. All telescopes require collimation, including refractors. The ability to easily collimate a Newtonian is actually one of its great strengths. Fixed, non-collimatable optics would mean the tube and mounts for the mirrors would have to be designed and built so much stronger that the extra cost, weight and hassle of doing that would absolutely dwarf the relatively simple job of collimating a Newtonian every now and then (which is really part of setting it up). The fact that Newtonian optics have to be aligned along not one but two axes perpendicular to each other probably doesn't help either.
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