Removing propTypes when using Context - no more error/type checking?

As we move through the course and use Context to access properties of state, we also remove the Type Checking. This makes sense as the Prop Types is specifically checking properties.

However, we introduced it to check for human error in passing down the correct information. Why isn't there a method to state the prop type when you create it in state? Like how if we create a const variable and try to change it anywhere, the console will display an error. As it stands we have cut down on drilling but removed the check for human error. I'm sure the assumption isn't that we will not make errors if passed from the original state to the component, right?