Head- and tail lights definitely help make bicycles visible from the front and back, but what about from the sides? The handlebar-plug-replacing SideLights are designed to address that shortcoming, plus they serve as headlights, tail lights and turn indicators.
I’m guessing they’re supposed to be in addition to a headlight…
I think they’re neat, make 'em cheap enough, brighter, rotatable so bar geometry is irrelevant, and move the controls somewhere ergonomic, and you’re heading towards a no-brainer. Although some 3d printer person might eat your lunch…