When I was younger, I used to keep a diary/journal file on my computers off and on. I was detailed about what I was feeling and what I was considering and going through. This all ended abruptly after my parents were snooping through my computer in middle school and discovered that I was questioning fundamental aspects of myself like my gender. I have never really felt comfortable keeping a diary file since then. I have made a few attempts at this (including by using a dedicated diary machine, air-gapped TempleOS machines and the like), but they all feel too vulnerable and open for anyone to read them.
This is my logic for using a language that I create for myself. If people really want to go through and take the time to learn the ins and outs of a tool I created for myself to archive my personal thoughts, they probably deserve to be able to read them. Otherwise, this would allow me to write my diary from pretty much anywhere, even in plain sight out in public. People can't shoulder-surf and read what they literally cannot understand.