> It makes sense to me that moving from electric to piston would require an endorsement.
For a long time, it will be the reverse; the default will be a requirement to be able to fly a conventional-engined airplane, with electric propulsion being an endorsement (probably devoted primarily to battery & power management)
Perhaps either way should require an endorsement. Gasoline is hard to fly... tank switching, carb heat, warm-up requirements, power output limitations, mixture at takeoff, mixture at altitude, thermal management in power reduction, weight of fuel in load calculations. In some models even CG due to fuel load. The list goes on and on. Electric ought to be much simpler to fly.
