Permanently disabling the stop/start is something I’ve done to the last two new cars I brought immediately after purchase. I imagine that’s a pretty popular warranty-jeopardising modification.
I recently replaced my starter motor ('09 though, so I definitely don't have the feature,) so I'd be wary of that, but don't they fit longer-durability starter motors in those cars?
Actually, come to think of it, (please correct me if I'm wrong) they probably keep the fuel pump primed while 'on' but at a stop, but I'd be concerned about the lack of oil at engine start. I always was told to turn the key to on, wait for the ~2 seconds for the fuel pump to prime and after you start the engine, and let it run a bit before starting to drive.
My cynical side wants to think the start/stop is a planned obsolescence 'feature,' but obviously I don't really know for sure.
It's an attempt at squeezing the tiny last bit of fuel mileage out in the standardised tests, and they obviously don't care if it wears things out faster...