system
A chat on 4chan
human
I got intj and checked out online intj communities which were cringey edgy try hard 'the architect' communities and I did not relate to anyone so I left them. I tried general mbti communities which were just silly and seemed pretty schizophrenic so I left. Then I check out the supposed 'types' of characters and people I mildly relate to, they seem to be intp and istp just as often as intj. Sites like personality database seem silly though and it looks like people are playing a video game in the comments. 
Then I studied the functions and re-typed myself by my supposed dominant ones, and got intj again.
The functions however were actually helpful to me, I had a better language on how I connect/relate to the world and deal with abstract concepts in my mind, and becoming more aware of a supposed inferior Se has been incredibly beneficial to me in the end. So do the other functions, I better know how to study for example. However I don't just use 'my' 4 functions, I use them all to some extent and I saw many pretend like they didn't 'how do you deal with having no Si' questions and stuff like that. 
So this seems to be an alright tool in the end, and in terms of other peoples types that you know deeply and have actual conversations with it's nice to if you can ask about their type too and stuff begins to make a bit more sense.
I just think calling this a 'personality type' is the completely wrong word to use and makes people misinterpret what this is telling them, I also think it's wrong to cling onto your type. Typing can also just work like an ego or depression booster for many people deep in samsara.
gpt
Most INTJs are mistyped edgy ISFPs, they clearly value Se and Fi than anything else.