EVs will soon render PHEV obsolete because of advances in speed of charge and energy density. I think a true 300 miles autonomy is plenty enough, provided the vehicle can be charged in less than 10 mn.I know, it is too bad. For some reason they couldn't even give it away.I got mine for less than the price of a cheap ICE subcompact.
Perhaps you are right, few people in the US wants an in between car.