I was serious enough once about personal accounting that I built my own web app because I thought the standard double-entry system wasn't really suited to the task. After I got the basic system tweaked to my satisfaction, I used it for several months.
I started to take it to the next level, but had the curious realization that I cared more for the process of developing the app than I did for actually tracking my finances. Eventually I gave it up, and went out and got a better job where I'm more fulfilled professionally and way better paid. I learned then that working on the app was substituting for professional fulfillment and vowed never to let that happen again.
Tracking cash inflows and outflows is an essential business skill. But a business is a machine, and people are not. Personal productivity does not respond well to wringing unit economics out of daily activities. If your goal is to turn yourself into a machine, by all means use a mechanistic approach. But we are meant to build machines, not to be them.