Cars with built in stop/start function do not use a traditional starter, so the "wear" issue is not a factor.not just a sales tool but a winner on car parts, now you have to install a new starter motor more often
90% of Aircons are electric, that being said, if you in "stop" mode for long, and the car realises that there's too much battery draw, it auto starts.Electric I suppose? Not crank driven.
Personally I almost never use it, as Renault's stop start isnt as good as vw. I think its more about passing emissions etc... The Mrs uses it most of the time in her VW, its very intuative and quick in her car.