It hasn’t read bothered me a whole lot, and I was actually happy to see that it had the feature. I do think the A/C issue could be a drag, but I haven’t been in a hot weather situation yet.
As far as wear on the engine/other parts, it doesn’t really concern me a whole lot. First of all, it won’t engage (turn the engine off) unless the engine is up to temp, and restarting a warm engine is not nearly as damaging as starting a cold engine. Also the starters have been engineered for this use case - it sounds like they are a different animal compared to the standard starter. Fuel savings will definitely vary by usage, but even if the 8% figure is high, 4 or 5% is still significant.
I found these links helpful:
Now that most new cars have auto-stop/start technology, are our vehicles becoming more vulnerable to engine and component failure?
bestride.com
You might think it's annoying and pointless. It's not
www.roadandtrack.com