I've generally found that the best case is the buck stopping at a smallish committee (2-4 people) who work well together, take joint responsibility, and appropr

I've generally found that the best case is the buck stopping at a smallish committee (2-4 people) who work well together, take joint responsibility, and appropriately communicate and split expertise. Individuals have a lot of blind spots and tend to get either overwhelmed or overconfident. But it's also true that the "work well together" part has a high failure rate.