I never understood this. I remember hearing that one of the first Bolt EUVs to hit the road was rear-ended shortly after delivery because the main brake lights are in what looks like tiny reflectors on the bumper and not the main tail lights on the hatch. Dumb design that, of course, the entire auto industry is in the process of copying. Put the lights at eye-level. No reason the Gen 1 Bolt brake lights couldn't independently flash for turn signals.
On the front, though, separating the turn signal from the headlight assembly is a huge advantage. The Bolt's front turn signals are clearly visible even with the headlights on. Contrast this to 2005-2009 era Ford vehicles that tucked the signal in the bottom inside corner of the headlamp assembly. Those are impossible to see if the headlights are on.