Thanks for posting this. Funnily enough I’ve been thinking a lot about that Simon Sinek video you linked to in the context of Grin as well. I agree, Grin would benefit from having a clearly defined Vision/Mission/Values statement.
Some early thinking around this topic is spread out across the documentation, see for example here and here. There’s also been some general discussion on the forum in this thread, and it’s likely going to become a topic of the now bi-weekly governance meetings at some point moving forward.
There is also an in-process attempt to form a coherent view on Risk Management, with the intention that this will drive some of the thinking around overall values and principles of the projects a whole. You see for example my own first stab at some of these in the doc.
All are encouraged to participate and contribute their thoughts as part of the effort of making this more formalised and defined.