THey claimed selling point, that it's gentler on the aircraft seems questionable. Why? Steam just provides a force, how quickly you change that into momentum should be up to you. It's not like steam is an explosion that can't be accurately regulated. It's just valves.
Here's my guess. When they built the steam system they decided to make it failsafe so that one the acceleration started it completed itself just by physics not by precision timing of valves. That way you didn't huck planes into the ocean due to a stuck valve. Presumably this led to less fine grained control of the force versus velocity curve.
I would guess that the electrical one will not have that desirable characteristic. What happens if one of the capacitor banks fails or the electro magnet blows up right during the discharge process? Nothing good I would bet.
No doubt this thought has not eluded them but it sounds to me like people on a project overselling their good features and ignoring possible showstoppers early in the development process. After all maybe they won't show up down the road as being important.
Perhaps an ideal system would be a hybrid. You run the steam with 120% of the FxDistance to get the plane in the sky, and then you run the electrical system in opposition, trimming off 20% of the force. That way it fails safe, but it also has the perfect force curve on the airframe.