www.16personalities.com/intj-personality
I'm ENFP and find it really useful to know about friends, family and colleagues.
Things like whether they are
- energised by being with others or need time alone to recharge.
- comfortable or otherwise with spontaneity
- big picture or details people
- logical or gut feel decision makers
If I don't know their 'type', I'll ask them in other words. Ultimately, I'll assess them according to their actions.
I wouldn't pick someone based on their type, but I would adapt my expectations about what was comfortable or a stretch for them, according to what they tell me about eg their need for solitude.
The basis in Jung-personality types is I think sound. Issues arise if it were used for selection. I have come across lots of people who have been incorrectly typed, especially at work, because the self they 'present at work ' is not representative of their true preferences.
eg DH at work is very comfortable explaining the logic behind his decisions. Now I know him so much better, I know that he makes decisions based on gut feel and then adds the logic because that's what people expect at work. I noticed this when we were looking to buy a house. I had s list of must haves and nice to haves, scored each potential purchase on those criteria. DH said either I like it or I don't like it for each house.
So helpful to understand differences in a neutral way.