...but the current implementations are sorely lacking: the idea is "just turn the engine on and off an order of magnitude more often than it's designed to," le

...but the current implementations are sorely lacking: the idea is "just turn the engine on and off an order of magnitude more often than it's designed to," leading to increased wear on the engine, meaning more waste as it wears out faster. That's just shuffling the pollution somewhere else in the lifecycle.