I've never really seen the dropped curbs as a hazard, but I guess it depends on how they are made and if they've been designed in from the start.

One "weird" complaint that I have with some accessibility features is that they mount things so that wheelchair users (and children) can operate them, e.g. a ATM mounted at groin height. I'm fairly tall so now I struggle to operate them or have to bend in unnatural angles. It's a small price to pay to make the world navigable to others, but almost daily I run into things that "are clearly designed by idiots". That is until I remember that the average person is below 180cm and right handed.