Until you have some reasonable way to quantify the likelihood that the CEO will see something shiny and insist on changing course, this just doesn't seem like it would be useful in the real world.
And the great thing about being able to run estimates quickly is that you can tell the CEO how much their new idea will send the timeline off course as soon as they propose it, so they can decide if it's really worth the cost.
I've been using this tech for years as a consulting engineer; this is just the dressed up version. It's been useful and effective for me, at least.