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Have you heard of something called money?
I looked into the price of active rectification. It would cost around 70 dollars in parts to retrofit an alternator with active rectification. An OEM could probably do it for 50 (Bosch has done this already on some alternators).
24V means adding DC-DC converters to power switches and lights and such. You would need to spend around 100 dollars.
They could also use thinner laminations to gain a little bit more.
The fuel economy difference would probably be well under 1% for all three combined, and no one would ever notice, so the manufacturer chooses to pocket the extra 200 dollars.
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