I think cost is the biggest thing for EVs. If batteries (mainly) were cheaper we could simply load cars up with batteries and have virtually no range problems. With a bigger pack you can pull/put more energy into and out of it. When you're talking a 80 kWh pack (over 3x the size of the Leaf's pack), even if you can't charge/discharge fast, you can still go ~300 miles. So, who cares how fast you can charge unless you're doing a cross country road trip. Otherwise you just plug in at night and you're good to go the next day.
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