[badpun]

I agree that it can work in cases where the business is actually well organized and knows what they want. However, what I've often seen is that nobody pretty much knows anything and/or they're afraid to make a decision and hence you need a product manager to go around various business units, arrange workshops etc. and try to pound out some definitive statements out of the business guys. This is super common on large multi-million (or billion) projects which are supposed to transform the whole org in some way. On the other hand, if the project is just for one business unit and they're the one driving it, then maybe product owner is less needed.

[goatinaboat]

Surprisingly often they do know what they want, even if they can’t articulate it they can demonstrate it.

The spec only becomes inane gobbledygook when filtered through a PM who doesn’t understand it but rewrites it in business-speak anyway, or an “architect” who also doesn’t understand it but thinks it needs to be a grand, generic solution.