When you can master all the functions. And I mean every single function. When you can master all the types. And I mean every single type. This would equal invincibility. No one could have anything on you. You can fit in anywhere. You can be friends with anyone. You can dominate any situation. And, I think this is the exact and only real reason why people study personality types. If not consciously, unconsciously. To achieve a state of invincibility is something all things that have ever have taken shape have desired.
And I think that what I am proposing is something more like an " inner locus of control" gained by a knowledge of socionics and adaptation to social circumstances.
Something like what I have here: