For a couple of years now, I've been developing features for a product that hasn't found product-market fit. Features that nobody _really_ gives a shit about. I can talk directly to one of the cofounders, bring them evidence based on analytics or the past failings of the giants upon whose shoulders we're standing on. His response is, majority of the time, "yeah, I get that. We promised this to a few customers and I really think it'll work". It hasn't worked.