Usingsuch intervals communicates the uncertainty within the model introduced by the scatter of the data instead of using the regression line that makes the relationship appear far more deterministic than it really is.
Brokers already take big bits of business and split them between individual companies, Lloyd's and other markets such as Bermuda (where rather than using a subscription model, the lead insurer often subcontracts risk to peers).
The fact that human error played such a part casts a shadow over previous franchise bids, although they would have been decided using a different computer model.