This makes a lot of sense, and I do some of that myself. But with regards to the "wound" metaphor, I sometimes feel like, by holding on to these wrongs that were committed to them, the INFJs I know are intentionally leaving the wound raw. Do they consider it to be "closure" when they've settled on putting the problem in a neat little box labeled "grudge" and placing it safely elsewhere?
To continue the metaphor with me - and this could just be my Si talking - there are always inevitable moments when I open up the junk drawer a couple of years after I've organized everything. And then, if I see a form of organization that I used before that I don't like anymore (e.g. a very messy grudge), I fix it, and close the drawer again. That way, the way I interpret the past becomes more positive and easier to live with. But in the present tense, if a new fact arises, I just go into the junk drawer, take out the old fact and place the new one where the old one was. I guess this is because I approach my memories and beliefs in a very utilitarian and Te way.
This really is an amazing thread. I had no idea about most of this stuff.
re venting:
Would it overall be better though to not engage those who find it taxing unless absolutely necessary, or does expressing appreciation help make it less of a frustrating experience?
Depends. With people who obviously hate it and resent it, then maybe venting at them more briefly and in a more subtle way, or warning them that you're about to vent and that you don't need advice (which is what my mom does with my INTP dad), or venting at other people, would be better. But in my case (dunno about other people), I'm totally fine with it - because I recognize that I'm being helpful when I listen despite not giving advice - as long as I don't feel like I was shamelessly used by the end. Even the tiniest acknowledgment helps.
re non-disclosure: As mentioned before, I hate emotional surprises. Therefore, before I put something out there, I would like to have weighed what your likely reaction is vs whether it is important enough for conflict or the feeling that reaction may engender in me.
Interesting! After all those times we've talked on TypeC and ESTJs not wanting to open up - this is so similar! I guess the difference is that with ESTJs, you can't always tell that they're holding anything in at all (hence the fact that awkward things often happen when ESTJs open up, in my experience), whereas I can always tell when my INFJ friends are withholding something. It makes me feel like "I already see that you're upset - am I allowed to know why?"
So sad about your ESTJ, though.

Did you ever end up telling him how you felt about that - i.e. that you were telling him about these things that were important to you and that he gave no response, and that you wished that he could support you in those situations?
And the "having an argument ready" thing is very interesting to me. I always forget that some people's value systems are based on what they believe, vs. evidence they've seen. Which is stupid of me, because obviously everyone has convictions like that (even NTs, much as they would deny it). And obviously, ESTJs pretty much have an argument ready for every topic
So thank you for that.
Oh, and p.s. My INFJ ex-roommate had this interesting habit - my theory is that it came from knowing that she needed to let that information out, and instead of worrying about people's responses, she would deliver the information in a particular way so that she might control the way people responded.
Example=
Me: You look exhausted. But you got to bed before me. Rough night sleeping?
Her (in a cheerful voice): Yeah, I was avoiding going to sleep because I knew that I'd have dreams about my dead father. *pause and subject change* So...
Me (in my head): AAAAH! WAIT!!! WHAT??!?!
Me (out loud): *goes along with subject change*
On the one hand, apparently she trusted me with that information, which is good. On the other hand, it seemed like way too much information to throw on a poor ESTJ roommate that she'd only known for a month and a half. But she needed to talk to someone about it... and I wanted to be supportive... but I just felt like, every time she'd throw out a scary little zinger like that one, wha-BOOM there's another 100 lb weight on my shoulders that I have to deal with. I know this is an unusual example, but it was one of those continuing situations that's uncomfortable in ways that it's difficult to express, and I really hate those situations.