I think this pretty much sums it up. If you have a skilled team with deep domain knowledge, you can afford to not be as detailed in the planning process as the

I think this pretty much sums it up. If you have a skilled team with deep domain knowledge, you can afford to not be as detailed in the planning process as the team is most likely already aligned. If you have a skilled team without deep domain knowledge, you need that sense of unity and alignment, that usually comes through more detailed planning. It's not one's correct or one's wrong, it just depends on the team composition.