You have valid points, but keep in mind that this isn't a typical plastic rattle we're talking about here... this is an issue that they weren't able to properly diagnose for nearly 7 months, then come to the conclusion that the issue was a broken weld in the hatch support area. Now, a couple months further down the road we find out that it's potentially something much more simplistic like a damper. I don't want to recap all of the events that have taken place, as they're already posted in this thread, but given the progression and variables of the situation thus far I believe I've been quite patient through it all
As for continually pushing, please take note of how it all started. There are spans of well over a month where I just figured I'd let them 'look at it next time its in for service.' I only began pursuing this adamantly once they identified broken welds and wrongfully denied my warranty claim. I'm not at my wits end with this, I realize things happen and 'losing my sh*t' over it won't accomplish anything at all... but it is a bit frustrating to have potentially located an issue that trained Subaru service technicians couldn't get a hold of for roughly a year now. Nevermind all of the invasive repairs with welding, the dings, paintwork, etc.
Here's an experiment, do I bring the car back to them and let them keep plugging away to see if they ever come up with an effective resolve? My answer is no, I don't think this would be very productive at all.
However, if the issue was/is related to a weld, as presumed up until this point (again, potentially)... This should raise at least one eyebrow for pretty much anyone. I have been ignoring interior rattles in this car, more so than I did in my Hondas (not that there are more, I've just got other more important things to tackle). I expect rattles, it's "just a car", and I will eventually get to sorting them out. The problem here is a metal on metal clanking/squeaking that shouldn't be an issue in even a first generation Kia

, especially if it's presumed to be caused by a broken weld, regardless of where that weld is located. I mean, if someone wanted to really make an ordeal out of this they could take the 'chicken little' approach and ask, "How many more potentially faulty welds are back there?" Again, I have better things to do.
Keeping in mind that they're not even aware of a potential realistic resolution at this point, I just feel that this has taken far too long to sort out. All they have is my voice mail stating the problem persists and that we'll talk today. Speaking of which, I need to make a phone call.....