Not a completely invalid argument, however, bikes on your roof have a massive effect on aerodynamics of your car, and therefore also affect your range. Along with that, the percentage of SUV requiring roof racks is fairly small (I believe). For those that really want electric, a rear-mounted rack is a viable option.

The uniqueness of the gullwing doors make a significant statement, which is probably more important at this stage in the companies growth vs satisfying a few people who won't buy because they can't have a roof-mounted rack.