I just read a description of the beta quadra. Really helped me to understand the infj in my life!
Here is the insight I gathered: infj may be an NF but they are a beta and that is more difference to infp than similarity.
For example: fighting for a position. Not caring much for personal shares especially in group settings. In group settings, sensitive to rank. Placing the onus on others to countersway (that is kind of an Se thing) Win points via forceful sway.
Betas voice views strongly.
Infp is in delta. When infp sees istp or estp, there is a clear sense of here is a beta. With infj, there is an illusion of more similarity than there is. The beta thing is not initially visible at all I’d say. I mean even if Ni+Fe is beta, for infj specifically, they just give a long lost cousin vibe initially.
And then gradually, the beta thing starts to be apparent and it is confusing.
Even the way I created this topic, as infp, there is probably something unbeta about it lol.