I don't think this is true. I've been given resumes by bosses of people I've worked with before and told them not to interview based on previous interactions, w

I don't think this is true. I've been given resumes by bosses of people I've worked with before and told them not to interview based on previous interactions, whether they were good to work with or not, etc. You can burn every bridge as you cross it but eventually that will bite you. We software people like to pretend everything is a 1 or a 0 but that's not the case in the real world. Relationships matter.