re my lovely mutual's opsec post there are some great comments and tags and you should go read them but I think the most big, obvious takeaway is that Thjazi was not being a withholding asshole who kept everyone in the dark for the sake of being a withholding asshole who kept everyone in the dark. He was part of a clandestine organization that was using the work of the Sundered Houses and House Tachonis in particular to try to address massive cosmological issues that, crucially, House Tachonis does not want addressed. The letter is in coded language - and crucially, it's not in a cipher (like the one Murray easily cracks) but rather uses oblique references that are difficult to understand if you don't already have the context, which most people only have because they have direct connections to Thjazi or to the things he was working on.
That doesn't mean that, for example, Hal is wrong to be frustrated and angry about this. But the directly stated framing for his anger about the paint in the Hallowed Round is specifically that the grief is really hitting him hard that night, and the barely subtextual implication is that he is grappling with the choices he had made that meant he was kept clear of all of Thjazi's dealings and which meant the last decade of his brother's life was one he was not particularly privy to. That is an incredibly emotionally complex statement that is ultimately about Hal's feelings about himself and his relationship with Thjazi than who Thjazi was. The idea that Thjazi was leaving an elaborate mess behind for everyone else out of carelessness, recklessness, or stupidity is simply untrue, and Mara makes it clear that he was simply captured at a very unfortunate time. [and, to be blunt, on a meta level that is the entire premise of the campaign, that Thjazi was killed for many reasons but one was that Primus Tachonis hoped this would reveal a plan the Cloak had otherwise kept fairly well hidden.]
