Except that it is not reliable so you can end up committed to an IFR transit in icing conditions and then find yourself without ice protection - have you seen how many pages of malfunctions there are in the 139 QRH just for IPS?
And you lose a valuable vibration absorber which can cause AP/AFCS problems.
Just the sort of issues you want with an electric TR..............
The idea that something is better just because it is electric and new is just fanciful. However, if the advances in electric motor and battery technology were as fast as computer growth and processing power, we might see some viable alternatives but we still struggle with generation and storage for electric power.
How well are electric cars going to do in UK with a National Grid generating system that creaks at the seams on a still winter morning when consumer demand is high and generation output maximums are reached?