That mode doesn't sound to accurate. Knowing how inaccurate the AF system is on some of the older bodies I bet the results were very poor or random. You would only have to miss one point with the AF and the whole series would be bad.

Still I think any of the extras we can think of, until processors reach a break away point from the sensors and IQ we are not going to see to many extra frill's. It is similar now to computers in the 90's and the expensive cycle of more memory and faster computers, then programs use the memory and speed up as fast as it advances. Now any new processor speed is going to things like noise reduction and increasing pixel density. I would think developers would look at DOF calculators and their first though is that everyone has a smart phone now, use it.