Yeah, I think it's a very rare project for which a strict HBR is necessary/desirable. But the principle that not just decisions but also the data used to justify the decisions take place in a public forum is important if you want a community to feel open and a meritocracy in which anyone can influence decisions to the extent they bring solid data and rationale to the discussion. If you want community members (that may be developers or future developers) to feel disenfranchised, just make decisions in private and wave your hands about private information. Note that many users may be fine with this approach; they need only trust that you know what you're doing and have all the information. But it stifles the kind of thinking and curiosity that fuels an active and enticing developer community.