I'd say that anything that exists in the backer milestones would be considered a foundational 'tenet,' but that's a very specific list. That's why, vis a vis RtWP, going completely TB would cause headaches at this point. On the other hand, Obsidian owns the IP. They had to follow their promises to backers for the games they produced. Now, the devs can do whatever they want to do. It's just a matter of how much pain they want to incur from the community in order to do it. Surveys might sway them, but the ultimate decision should be theirs. Personally, I like it better that way. Sure, listen to the players in order to get new ideas, come up with features that will appeal to a broader group, identify the features that are vital to keeping the core players happy, etc. In the end, however, I trust the devs' vision of the game much more than a mob of unruly random internet folks. Otherwise, why wouldn't they simply go off of existing sales of other games and try to replicate what's already been done? People want to think of video games as an art form like movies or literature. How can we call it art if we don't allow some freedom to the artist?