I have a slightly different understanding of this latest auto preload setting system, which I have on my bike. I believe that the AUTO mode attempts as far as possible to keep the suspension sag at the ideal setting, which is generally considered to be about 1/3 compressed when fully loaded. At this sag the bike still has about 2/3 of the suspension travel available to soak up bumps, while having 1/3 available to extend the wheels down into negative bumps, i.e. holes.
Because the bike has level measuring gadgets to determine and monitor suspension compression, it knows when the weight on the bike changes, and by how much the sag has increased, so will adjust the preload accordingly to get back as near as possible to the ideal sag. Because it knows how much preload is needed to reach this ideal sag state, then it can infer how much weight is on the bike and can also factor this into the dynamic damping adjustment - biasing it towards more compression and rebound damping for heavier loads.
My feeling is that MIN and MAX are not equivalent to previous settings as according to the manual they simply give you the minimum possible preload and maximum possible preload respectively, regardless of the load on the bike and what sag that results in. I think this means that they are not necessarily equivalent to the old rider only and rider and pillion plus luggage settings, as these were intended to get you the correct sag and damping for those loads, albeit they were factory chosen presets to suit average weights of rider, pillion and luggage, so would only be approximate for most users. This is why the new AUTO setting is better - it sets the preload for the weight actually on the bike, not for theoretical averages.
Maybe MAX is useful if you are off road and want maximum ground clearance but I can't quite see why you would want MIN. I don't think it is supposed to be used by short riders just so they can reach the ground as this will make the sag greater than ideal, and the damping possibly less than ideal, especially for heavier riders. Maybe it would be helpful when getting rider and pillion on the bike though note that you cannot change while on the move, so would have to select AUTO when stationary, but this will not adjust ride height to the correct level immediately, it only does so once you are moving so you would have to start off with a less than ideal configuration until the AUTO mode does its stuff.
Fred