I drove it just once on a highway so far and I'm not fan of the ACC, so I didn't use it.
My wife's canadian imported civic X for sure had a flat driver side mirror, as you said. Replaced it with aftermarket mirror (just the glass part) and it's one idea better now.
@feldsam checked yesterday the mirror - still not sure what it is. It's not teasing me like the civic one for sure and it has better visibility. At the other hand, it has no label "Objects in mirror are closer..." and compared to the passenger one, cars behind look bigger. But could be also because I'm watching it from closer distance. Also it has no outer side part, separated with line.