Yup, that was what I found. The electric WP will be fine for the street as long as it is not 100 degrees and stuck in traffic, which I don't drive it under those conditions.
Whenever I've been in houston it was always 100 degrees and I was always stuck in traffic, even when I lived there as a kid.
I think if it was a good idea then many manufacturers would be running them, I don't remember seeing them on anything built outside of europe and those are pure garbage.
My wife's GLE580 uses electric WP and electric AC, matter of fact, electric everything with no belts. Make the "stop" portion of the "start/stop" feature very nice. It has the bi turbo 4.0 integrated with a 48-volt motor-generator that gives it an extra 21 hp and 184 tq. Hardly "pure garbage".
