Why Vaadin's API has not implementation of toString()

Hi, I am new in Vaadin but not new in Java world and I have been learning about UI components and how to make the designing of UI's faster, while this I notice that none (because I haven't seen it all yet) Class or components overrides toString() method. This is very useful when you are trying to understand the behavior, see default values, its attributes, mostly Events properties (what can we get from these events).
Running with debuging is useful but not always