I am going to give my best guess here Platy lover. Fish are not demanding. I think it is really that simple. If I am a person who has trouble with interactions, as I am, I can simply look at my fish and enjoy them for what they are. Nobody demands anything from me at all for paying attention to them. I am also borderline autistic by today's standards BTW. In my own experience the fish give me far more than they ask of me. I take what are seemingly easy actions and the fish reward me with their beauty and with good health. I can even go a bit further by helping people in places like this without needing to confront anyone face to face. That gives me a bit of satisfaction in doing something worthwhile that is within my abilities to accomplish. I find that terribly difficult to do in other pursuits.