The fundamental issue is the concept of remote triggering...the assumption of the past (in the days long before AF was invented) was that the photographer prefocused at a point, went off to hide somewhere, and triggered the camera to take a photo when the desired target wandered by -- or when an intervalometer automatically triggered the camera at a predetermined interval. No need to re-focus the camera.
Fast forward to AF cameras and wireless triggers. Now folks think that the camera should focus each time...but the camera will focus on some randomly chosen edge feature in the frame -- often on the WRONG items in the frame, when all-points AF is used. There is no good way to choose some focus point when the main target happens to be at one edge of the frame, to overcome the inherent limitations of all-points AF (if you have ever tried all-points AF thru a chain link fence at a target some distance in the background, you know all too well the limitations of all-points AF ! :cry
In essence the AF camera remote triggering is really most analogous to the old manual focus remote triggered film cameras of old, and not much better than that was!