(Assuming you mean a very small EV on the "smart car" scale.)
They are less broad, seating is in-line rather than side-by-side (more suited for a taxi), they are designed to move through messy traffic such as pedestrianized areas rather than on open roads, at lower speeds, with lower energy expense.
Taxis are pretty cramped already, as a rule. I cannot fit comfortably in many smaller cars, and have difficulty getting my legs in front of me and keeping my head upright. I'm considered tall, but not hugely so; what are such people to do? Let alone wheelchair transport? Keep in mind that smaller transport options such as these are typically used in places where the average person is much shorter. They are also usually not accessible to the handicapped. Finally, many Americans are too fat to fit in narrow seats.
They are less broad, seating is in-line rather than side-by-side (more suited for a taxi), they are designed to move through messy traffic such as pedestrianized areas rather than on open roads, at lower speeds, with lower energy expense.