Maybe because there are people like me who have already had to have the aux battery replaced under warranty at 21,000 miles due to it failing. Just got it back the other day and guess what...it's already starting to fail again. Stop/Start constant reading "not ready" and when it finally does become ready and actually shuts the engine off at a stop light, when it starts back up it now shakes the entire Jeep, gives a warning light about power steering failure and then starts. The whole implementation of the ESS on the Jeeps is a complete failure as evidenced by numerous threads on here and JL Forums about aux batteries dying and everyone looking for a bypass.Gotta agree here.
What I still don't understand is all the hate for the ESS.
It's proven to lower fuel consumption.
It's proven to reduce emissions.
The vehicle is designed to withstand the additional start cycles.
It's ready to go by the time you get your foot from the brake to the accelerator (at least for me.)