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I'm not talking old Cadillac floating, I'm talking the over-stiff setups people put on street cars that bounce them all over the place or spins or slides them off the road when they can't absorb a bump mid-turn. The purpose of the suspension is to maintain the contact patch and when it's too stiff to do that, it fails. I've laughed at many a ricer idiot showing off in the straights when my fairly comfy, only slightly stiffer than stock, Subaru passed them on the inside of the turn at the end. On a track, the stiff set up would probably win, but not on America's crumbling infrastructure. Even hardcore sports cars that have to spend time on the street aren't sprung as stiff as racecars.
Unsprung weight is also a bigger deal with lighter cars as well, for the same reasons of the wheels being a larger percentage of total weight. A light car can be made to handle well and ride well, but only if the potential load difference is kept small (or it runs with a full load all the time, I suppose). I'm not against light cars, quite the opposite, but there are some concerns when designing them that many people don't consider.
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