I have had my experience with immature INTJs and they are hard to manage. Under-developed INTJs are tough to get through, difficult to talk to and hard to connect with. They basically think they are perfect and will refuse to listen to you unless you speak their language to the exact pitch.
I am not saying I am against them. Not at all. I have the privilege of knowing several INTJs who are mature and they are a delight to be with.
I found some funny and amusing posters about them. If you are an INTJ, you may disagree. It's ok. They might or might not be true.