There is an admirable economy to questions that provide their own answer.
It would be nice if you provided any evidence to the contrary. I'm not saying that they are all at least somewhat intelligent, I just want to understand how someone could be dumb with these features. Intuition allows people to understand and produce theories. This could cause someone to come up with a stupid idea yes. I might say, it would be a great idea to teach hamsters to ride motorcycles, but then as an NT my thinking would tell me it is unfeasible as hamsters are very small, not particularly intelligent and their bodies are not designed in the right shape. I want to know how an NT can, for example, not think any intelligent thoughts and not rationalise crazy thoughts. I am open to being proved wrong, but that is not what you have done.