Hit a pot hole with any aluminum rim and you can do damage. Thats a fact...
Who the hell is this guy anyway??? sounds like he doesn't want your business, handing you all this crap...anyways, back on track..
Wheel lock will be slightly more difficult with a larger tire. But the stop will be better... and ABS works regarless of rim size, it takes the readings off the rotor, not the tire.
Stiffer ride----
A lower profile tire will need stiffer side walls to resist rollover, so yes the ride will get a tad harsh, but the tire choice will affect the ride to some extent, some are better than others for ride quality. Michelin for one, is vertically supple for ride quality, but laterally very stable for cornering. If you lower your car you can opt for slightly less aggressive spring rates and adjustable shocks for more control.
It sounds to me like this guy is used to selling to the typical North American driver that doesn't want to feel the road, just stay on it. LOL... a personal choice...
