I've worked in one (1) effective agile team in my entire career, and that one had an end user fully integrated into the team, providing near-realtime feedback a

I've worked in one (1) effective agile team in my entire career, and that one had an end user fully integrated into the team, providing near-realtime feedback and prioritizing bugs and feature development. But this would leave the product manager out of a job, so I've never seen any other company even try it.