Just forcing a company to say "We expect X amount of growth in the next financial quarter, and the reason we expect this amount of growth is - even though we are an international financial corporation - guesswork and gut feeling, rather than any kind of formal model" would be a step forward.

You have two companies. Both predict X growth. One provides a full model which backs up their prediction. The other flat-out states that they made the number up. Which would you pick? It doesn't actually matter - the point is that their operations are more transparent and your choice is more informed.