At our 17-person custom software development company we've been working on our Holacracy practice for a little over 2 years now. Last year, based on multiple tensions (mostly about spending money), we adopted a variation of the Advice process. So, anyone can make a decision, but everyone expects you to consider who will be significantly affected by it and that you confer with them beforehand.
In practice, this works well for us and is basically an implicit policy in the style of what Brian says H1 has. This got me thinking that we should definitely make it explicit in our governance records