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Cost. And not just of the battery. Liability, research and development, altering the electrical system to work with it...unless the public starts demanding it, they have little reason to change it.
Whats the battery do? It only has to crank the engine for a few seconds, hold some power to run minor things with the engine off, and as a brief backup should the alternator die...anything that can do the(not all that important) job is good enough...why would they make it more complicated or expensive than necessary?
No one is going to pay 3x as much for a UPS that has lithium batteries that is only needed for a few minutes here and there in a blue moon.
It will die off when ICE engines do, or safer and cheaper lithium batteries come along.
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