Sprint planning estimations and who is involved
In the past but only in 1 team, during the sprint planning, the product owner provided also an estimation for the story discussed, not so much as to use that estimation instead of the developers, but more as a way of discussion and to have more clarity as a team how complex are the various stories.
That approach had worked well for that specific team, due to the composition and product owner, but haven't encountered it again. I was wondering if such an approach is being used in general or it was an exception?
Most product owners I have worked with don't have enough detailed technical knowledge to make good estimates. There are exceptions though. It ought to be up to the development team. If they find it useful to have someone else's input to estimation then why not do that, but the developers should still have the final say on any estimates.