No it's not, Hears was only KOd in his prime against 2 hardest hitters in boxing, Ray Leonard and Hagler. And his first KO against Leonard, he was getting hit with huge shots and it took 14 rounds to get KOd.
Ricky hatton comes to mind to an extent anyway. Hearns Roy Wlad is the best example I think, bad chin, great defence
Wlady definitely doesn't enjoy being hit on the kisser. Just so big and awkward, good defensively, it's not easy to land solid.