Flashlights on their wrists
One thing that always bothered me when I first watched Voyager was the way they wore the flashlights on their wrists. It was always so awkward for them to have to move their entire arm and point their whole arm at whatever they were looking at.
It didn't seem to serve any purpose. There's no technological limitation that prevents us from mounting them this way now, yet no one wears a flashlight this way. That's because it makes little sense to do so.
I can't see how this was even a thing in this show.