I had a very similar experience as you with interviewing and feedback. Some places I felt did genuinely find a better fit and would provide some specifics, othe

I had a very similar experience as you with interviewing and feedback. Some places I felt did genuinely find a better fit and would provide some specifics, others were oddly evasive when I tried to question them further. I eventually figured out that in many cases they had an internal candidate that they were going to hire and they were interviewing you to satisfy some requirement. At the onsite, when they ask if you have any questions at the end, I now always ask how I stack up to the other candidates and listen to that. If they don't mention anything, I will follow up with "Do you have any internal candidates?" and often they will just casually mention, "Oh yeah, Steve's great, he'd make a good PM." Now when I follow up for feedback I would say 80-90% sound genuine about better fit and will usually explain why. Before I would say it was around 50/50. So it's possible in your 7 interviews, 3 or 4 of them weren't real, and they did find a better fit for the others which doesn't sound as abnormal.