I picked up obsidian because it is a perfect diary app w/ templates and daily notes built in. But it’s so damn customizable that my obsidian notebook has become an all consuming passion of knowledge base and personal project managment that requires me to be productive IRL to generate more content for me to catalogue. Really appeals to the data hoarder in me, been a game changer. Highly recommend. Perfect 5/7.
Used to be embedded systems mostly. Microwaves and the like. Although with the advance of the smart home I don’t know I’d that’s still true.