In the past, I've had a couple of awful experiences with flat/blowout tire emergencies WAY out in the sticks, and was saved by having a spare tire. In both cases, an emergency slime/inflate kit would not have helped, and no cellphone or roving highway patrol assistance was available.
With the Bolt, I don't really expect to be out in the middle of nowhere very much, due to irs range limitation, but if I did that regularly, I'd really want a spare tire along (even emergency size). I'm wondering why a "continental kit" type of spare carrier couldn't be developed for such occasional use, to mount on a light-duty receiver hitch. It shouldn't be much of an engineering challenge, and the ugliness of having it back there would only need be temporary.