In an ideal PT Maul shouldn’t have used light sabers either and Dooku shouldn’t have used force lightning.
The way it is now is so inconsistent with the OT. Vader and Dooku are fallen Yedi. Why would Dooku be able to use force lightning when Vader obviously couldn’t in the OT (and RO)? Despite the facts that there was more time between the PT and the OT than between TPM and AOTC and Vader beeing the chosen one and Dooku not.
Vader can’t use force lightning because it would fry his suit. That’s literally what killed him.