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The R18 e-tron sends the extra power to the front wheels (effectively making it a four wheel drive). I guess the rule was put in place to negate any advantage the R18 e-tron will have when cornering.

The other LMP hybrid is the Toyota TS030, their system applies the extra power at the rear only, and therefore Toyota can use the electric power at any speed (race reports of the 2012 24 hr of Le Mans said that the Toyota TS030 was eerily silent going down the pit road as it was running on pure electric power on pit stops).

Of course the R18 Etron is a Flywheel based system, which has little relevance to road cars. it's Also caped at 500Kj of energy that can be stored and released per braking.

IMO that rule was made to prevent the cars from going through slow corners too fast, The speed restriction only applies to cars that have the motors connected to the front wheels. The Toyota cars have their hybrid motors attached to the rear and they can use their hybrid system from 0 kmph.

Presumably because of the torque an electric motor can make off the starting line, versus an ICE.