I've looked into that when it first came out. Computer- run and programmed so every horse gets a specific ration, split in several small meals, at specific times, and once horse had it's portion, it can't get more until it's his" turn" again. They apparently learn quickly that bullying others away doesn't get them anywhere, and standing around waiting is equally senseless. I suppose it's possible also for hay feeding. I can see that larger facilities would appreciate a set up like that, if they wanted to stay "natural". I personally would want to feed myself, to be able to overlook my horses really quick, to see if one is off, has troubles, feels good.
The set up of these facilities is somewhere along the line of a paddock paradise, with feeding areas, rest areas, different surfaces, all made to encourage movement. One also has to keep in mind that, in general, Germany doesn't have the large acreage available like here in the US, so smaller spaces with more horses need to be used to their full potential.