I don't agree. I assume we're all professionals but some people are oil and water, doesn't mean you need to burn a bridge. Tempers cool, favors sometimes need returned, references are there in the future. I'm not burning a bridge with an exit interview. I no longer owe the company I'm leaving anything, but I'm leaving the bridge intact. I leave on a good note, I might call out particularly talented people that I feel get overlooked but otherwise I generally won't even have one bad word to say, even if I want to.