When I chose to pursue a career in computer science when I was 15 years old, it was basically on liking math and physics. I want to distance myself from writing posts, essays, etc. Time goes by, and now, one of the things that I value at a mature company or team is the existence of technical documentation.
Docs help us to gain historical knowledge of our company, reevaluate decisions, and comprehend the trade-offs between all the decisions. It is also beneficial for the newcomers because it tells them a story. The richer in detail it is, the better it is.