Less weight = greater range, but yeah, I don't see myself getting this type of setup any time soon. If my battery dies, it's nice to just be able to use it as a regular bike.
I've been saying that this is the future of e-bikes for a while now. Makes so much sense. You are essentially a generator feeding power into the battery. Why introduce mechanical bits for no reason?
I kinda like that I can still ride my EP-2 Pro if the battery dies (though going uphill really sucks with a 74 lb bike lol) and that if my chain breaks, the rear hub works independently too. I'm a fan of redundant backup systems though, probably also why I put Tannus Armor liners and Flatout in my tires.
Theoretically if your battery dies, you'd just need to peddle for a certain amount of time to feed electricity back into the battery and you should be ready to ride again. T3chnically you should never run out as long as you are willing to peddle.
Like a fancy version of those hand crank flashlights.