An electronic governor wouldn't care about that. The important engineering issue for an ICE car would be the gear ratios of the upper gears but that's already

An electronic governor wouldn't care about that. The important engineering issue for an ICE car would be the gear ratios of the upper gears but that's already pretty well handled. Fundamentally there is limited consumer demand for a governor (but some from parents and also Volvo does it to support their zero deaths goal). In the end, governments should mandate this but the value is not incredibly high compared to many other safety features. Sometimes deadly accidents happen because a driver is going 100mph but for the most part it's people running red lights at 50mph in a 30mph zone (which should be 25mph) that cause the most carnage.