I don't like the Controller making the decision on how to greet my users, first of all, because Controllers need to stay lean. I want my users to be greeted a bit more dynamically, depending on the time of day, and that will increase the complexity. Second of all, maybe I will want this greeting to be done elsewhere also (as, it turns out, I will do), and there is no way I am copying and pasting this logic somewhere else, nor am I going to misuse the Controller just to be able to call that method. The solution? We delegate the logic of constructing the greeting to a service and use that service in our Controller to simply output the greeting.