I'm concerned like this a quite a blanket statement. Are all EVs that much simpler? There are simple EV drivetrains and there are complex EV drivetrains. Not all EV drivetrains are the same.

This also applies to ICE. Most ICE drivetrains that do not have forced induction tend to be quite simple. Forced induction makes the drivetrain much more complex and puts a lot more strain on the drivetrain, and is one of the reasons why Toyota has stayed away from forced induction.

Is the drive train in a Tesla Model X P100d much simpler than that in a 1.5 NA Yaris? I'm not sure, and would love to be proved incorrect on this.