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Honestly, it kind of feels like the industry should have figured out how to make a gasoline engine by this point in the product's lifecycle.
kagis
https://www.aa1car.com/library/ford_engine_valve_failure.htm
I guess it was due to a new material and that they were probably using it due to fuel efficiency requirements, so I guess it's kind of a new environment.
That’s an interesting argument, I usually don’t think of valve stem weight when considering the weight of the vehicle.
It more likely related to the valve being able to move faster with less force. That then allows the engine to run more efficiently.
Probably not low-hanging fruit for weight reduction, but manufacturers have been reducing weight across-the-board for decades, so I expect that the biggest wins have probably been done a long time ago.