i have a theory that not only is it great that its possible to create your own tool, but its actually the best possible way.

there is no one right system that works for everyone. or as op pointed out even one system that works for a single person as their needs change over time.

the thing that everyone should do is create their own system that works just for them. unfortunately its still a tradeoff even if llm does all the building, upfront effort and ongoing effort to establish the system and maintain/iterate.

the analogy that comes to mind is tailored clothes. most of the asanas etc. of the world are built to fit a broad number of people pretty well, but its people fitting into the clothes. diy is like a tailor cutting the clothes to fit you exactly. and just like tailored clothes vs off the rack, if you change shape the tailored ones are going to be easier to adjust.