I see, the sight-comments sound as annoying in german as they sound in english. (Have my game in english so it's always funny for me how they are translated).
In all honesty, I gave up worrying about the view ofplanco people in my park (all sandbox with unlimited money) as this is the one thing that gives me high blood preassure. These people are dump enough to try to watch animals standing 20 meters away from the barrier and complaining about the view, instead of just walk a few steps further.
However, I learned that in real zoos they worry about something that is called cross-viewing when planning a zoo. Couldn't exactly find out what it is, but as I understand it, planners make sure that you do not see two habitats at once, so that you always focus on the main attraction at that moment. Also you should not nesseccarrily see guests walking at the other side of the habitat, I guess. So I try/ will try to accomplish that in my projects.