Smirk all you want, but I've used them for indoor simulations, delineators, marking lights, etc. The remote control version is neat because if you are doing something like building search or active shooter training they can be used as a start or stop light, or a no-entry marker.
I use the marpac lights for outdoor stuff and they've worked out fine. Both are bright enough to be scene through a fog-filled shoothouse or outside in HC smoke, and beat the hell out of lugging around 12 volt batteries to power-up "real" lights.
I sure as hell wouldn't put one on a car, but they have their uses.