Maybe I'm missing something, but if you only talk to "A*" teams, aren't you running the risk of confirmation bias? Maybe there are groups/companies out there doing the things you recommend, but not succeeding. Did you look for any of those?
Not saying it's definitive. It's just what we learned from a bunch of product teams that owned a single product or scoped our feature-set. Thanks for bringing up the point though, I made it clearer on the post.