I think that Robin was saying that anchoring, not the arbitrariness of starting points, is the big problem for transitioning from qualitative to quantitative thinking. You can make up numbers and so long as you update them well you get to the right place, but if you anchor too much against movement from your starting point but not against movement towards it you never get to an accurate destination.
I think that Robin was saying that anchoring, not the arbitrariness of starting points, is the big problem for transitioning from qualitative to quantitative thinking. You can make up numbers and so long as you update them well you get to the right place, but if you anchor too much against movement from your starting point but not against movement towards it you never get to an accurate destination.