A shame; the taillights are so huge (let alone the entire stupid concept of lights in bumpers, pioneered by chumps buying luxury cars and now inflicted on the rest of us).
Actually, the taillights including the directionals in the bumper is mandated by law here and in other countries in vehicles where the primary taillights raise up with the lift gate. A secondary set of lights are required in the bumper, or on some fixed portion of the rear end. The idea is so that if some one were to carry cargo with the lift gate up, the car would still have operable tail lights, brake lights, turn indicators and reflectors.
The lights go up with the lift gate on the Bolt to allow us greater unobstructed access to the cargo area as well as being somewhat less expensive to manufacture. It's a design choice. The main taillights in the lift gate could also function as turn indicators by flashing, but since this car was designed as a one size fits all countries and nearly all other countries require the turn indicators to be amber colored, the LED taillights on the Bolt can not be used like that, so we are stuck with just the amber lights in the bumper.
Again it was a design choice. This time just for style and possibly some cost savings. Chevy could have designed the main taillights to have amber turn indicators imbedded in them and we would have had both brake lights, taillights and turn indicators in the main lift gate lights. This is what I would have done, but they did not do that for whatever reasons they had.
Anyhow, that's how we ended up with our turn indicators in the bumper, not because of chumps, or luxury cars.