I love the “truck factor” analogy. Great way of ensuring that the company isn’t reliant on one single person. I think that may also sometimes even include the manager (I.e. the team should be able to manage themselves for a short period of time if needed), which goes back to what you said about encouraging the team to make their own decisions when possible/practical

Yes definitely, ultimately the team is a team of experts so they should be able to run without a manager for a couple of weeks.