Traditionally you deal with the lag with variable pitch propellers. But with electric motors you can have a lot of immediate / momentary torque and power and in

Traditionally you deal with the lag with variable pitch propellers. But with electric motors you can have a lot of immediate / momentary torque and power and instead vary the propeller speed. I think what is aimed at with electrics is you get a lot simpler aircraft with far lower operating costs and higher reliability and availability. No engine maintenance, no variable pitch propeller, no fuel systems (you do have batteries but they should be self contained man changeable systems). No huge checklists with warmup etc procedures on the ground. It's worth it to just have 30-60 minutes of flight time, because you still get to train takeoffs and landings. Maybe the instructor and student can first swap the new battery with 5x20 kg units or so, take off, do a few touch and go:s, land, then let the next guys do the same.