I think you are both right, to some degree.

It's been some since I have used C++, but as far as I understand it RAII is primarily about controlling leaks, rather than strictly defined state (even if the name would imply that) once the constructor runs. The core idea is that if resource allocations are condensed in constructors then destructors gracefully handle deallocations, and as long you don't forget about the object (_ptr helpers help here) the destructors get called and you don't leak resources. You may end up with a bunch of FooManager wrapper classes if acquisition can fail (throw), though. So yes, I agree with your GP comment, it's the deterministic destruction that is the power of RAII.

On the other hand, what you refer to in this* comment and what parent hints at with "When implemented properly" is what I have heard referred to (non English) type totality. Think AbstractFoo vs ConcreteFoo, but used not only for abstracting state and behavior in class hierarchy, but rather to ensure that objects are total. Imagine, dunno, database connection. You create some AbstractDBConnection (bad name), which holds some config data, then the open() method returns OpenDBCOnnection() object. In this case Abstract does not even need to call close() and the total object can safely call close() in the destructor. Maybe not the best example. This avoids resources that are in an undefined state.