> So every employee gets to be badmouthed in front of as many as hundreds of former co-workers, as Netflix's special parting gift?

This isn't what happens, as far as I've seen. These e-mails/meetings don't badmouth people or imply that they weren't competent. They give context around specific ways in which the person wasn't meeting expectations (as well as outlining out the ways in which the person was positively contributing). IME it's valuable context and isn't an assault on anyone's dignity (or "trash talking") like you're suggesting.