Where is the battery going to go and how much will it weigh?
The answer to most problems lies in battery technology and therefore size/weight vs power. In the future maybe but now????
Much the same is the improvements in steamship technology and efficiency did but it's not an overnight solution.
It's not an overnight solution, we started many years ago, it just seems that very few people recognise it.
This thread isn't about the All Electric Rotorcraft it is about an Electric Tail Rotor so for the moment generator driven I would suggest. Battery technology is advancing, but I expect FW to take the lead on all electric flight. Don't dismiss the ETR because of battery technology.