I was reading a thread where people were saying if you bought a bad example of a car in worst case you could always rebuild an engine, replace suspension parts etc. However somebody said even if you rebuilt engines and replaced parts you wouldnt be able to replace a chassis and so you should always look for a well looked after example and you will feel the difference in drive(due to the chassis). I don't think he was referring to a chassis that is damaged in an accident.
However as far as I'm aware the chassis is just the metal frame and provided it hasn't been dented. smashed, cracked etc due to an accident, it doesn't really go bad and you shouldn't notice any difference in drive due to the chassis you have, rather it's the engine and suspension parts etc and their condition that will make the drive better or worse.
Is his comment correct, if so why or are my thoughts correct?