My father has a 2015 i3, and it's more than fast enough off the line- my Bolt is the same way even though they are both 6+ sec 0-60. EVs have instant torque and in fact are a bit scary to me as both the i3 and Bolt have small wheels.
Some people think 6+ is "more than fast enough" and others want the thrill of 3.5 seconds. There are enough people in the second group to keep manufacturers making cars for them.