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(IMHO)
Although things are changing, most major manufactures use the US as their basis for major technology decisions (Switching to EV's may be the exception, but it took a US startup to really change the game). As you are well aware, there are vehicles/models/engines that never make it to the US, but still, the largest single country that makes or breaks an auto company is the US (technically the number 1 is China, with the US as 2nd, but I do not hear much about worldwide design influences driven by the Chinese market).
When battery tech for longer range EV vehicles exists across all manufactures, it will drive down the prices of shorter-range EV vehicles. You honestly won't have significant price drops until there are regular options for 600 miles with 30-minute charge times. We NEED the charge per weight to significantly decrease in order to facilitate this. They can then simply put less batteries in shorter range vehicles to decrease the prices.
It's like how, it takes Mercedes and other luxury vehicles to make features available on their high-end models, before that same technology becomes cheaper and available on every day vehicles (GPS, airbags, collision detection, lane departure, back up cameras,...).