- What defines an INFJ is that they have Ni (introverted iNtuition) as their dominant function and Fe (extroverted feeling) as their auxiliary. Certain combinations of cognitive functions tend to correlate with certain traits and issues, but that doesn't mean that EVERY single person of a type will have the same traits/issues. That's why there's so much variance in how different people of a single type will relate to a particular type description.
So altruism and perfectionism may be common traits for INFJs, but that doesn't mean those traits are part of what defines INFJs. There are plenty of INFJs who are not altruistic and perfectionistic.