That’s true. On the other hand, nobody flying an electric airplane is going to crash because they forgot to switch tanks, or the carb iced up, or the engine swallowed a valve, etc. And the “fuel” gauges will actually be accurate. Battery technology isn’t where it needs to be to make these aircraft practical, but there are a lot of people investing a lot of research into making better batteries. If they succeed, electric propulsion will have a lot of advantages.