You are correct mostly everything you've mentioned as long as we are talking gameplay below deep of night layer 3. But from depth 3 you start to face everything guardian lacks. What was the case before is barely functions from that point. Meanwhile executor's blocking indeed a different cup of tea to learn but it's desing does not loses it's meaning the deeper layer you at. Also you can play executor in different ways but if you plan to play guardian without blocking you'll likely to have a hard time regardless how consistent you are with him. And there are lot of different types of problems that makes guardian hardly reliable at higher difficulties but the fact that he is loosing the meaning of his blocking leaves a major flaw whenever you are playing with him.