This is another example of technology getting out of hand. As I went digital, I had to familiarise myself with all sorts of concepts only to subsequently dispose of most of them, like having twenty two subject modes, none of which are needed for serious photography where the camera operator still knows what he is doing and remains in control.
I am not saying that this Sigma device is unnecessary, just that it ought to be in the labs of manufacturers. If one is using high quality equipment where fine tuning to this degree makes sense, for the exorbitant amounts one has to pay, let them get it right before the user gets to buy anything or, if we are talking about an option like adjusting the autofocus seek range, let them build that into the camera to adjust, where it should be in the first place, so that one is not stuck with one setting per shooting session.
Everything now is becoming so unnecessarily complicated that soon you will need training just to suck eggs.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.