Agreed, not always easy to read, but I found a few particularly enlightening:

The Branch Banking Model

https://bam.kalzumeus.com/archive/branch-banking/

https://news.ycombinator.com/item?id=32679233

^ I no longer despise local bank branches, it's a tough business.

Money Laundering and AML Compliance"

https://www.bitsaboutmoney.com/archive/money-laundering-and-...

https://news.ycombinator.com/item?id=34743896

He's very proud of his strange Twitter threading style where he asks himself questions then answers them in a way that makes all the threads three times longer than necessary.