I've given exit interviews on occasion and they've been generally beneficial as well. One kept the door open to return to the company a year later with the mone

I've given exit interviews on occasion and they've been generally beneficial as well. One kept the door open to return to the company a year later with the money I asked for and mandate to do the things I said I wanted to do when I left. The other helped the company after I left to course correct and bought me free drinks whenever I'm in a particular town. If I'm leaving it's likely just a business decision (whether informed by management, direction, or dollars) and there's no reason to close the door on future business (with that company, those coworkers, or investors) to revel in some spiteful comments.