I just vibe coded my own and it ended being perfect for me. It has a lot of features, but those features are all things I wanted and evolved with use. I guess what I’m trying to say is that you can spend time learning someone else’s system, but in the year of 2026, you can probably but together something you already know how to use just as quickly.
If it works for you, then that's great. I'd rather you be a happy customer of your own work, than an unhappy customer of mine. I built this for myself, first, and as I was using it, I had to tune it as new things came up (weekends, vacations, deadlines, etc.) just like you did.
I'd question your "spending time to learn someone else's system", here, though. The UI flows are built around using the app as little as possible. For me, I use voice input with a gesture, so bring out my phone, double-tap, say something, then put it away. I read the email once a day, and tap done 1-3 times a day (either from the email, or directly from the app). That's about all I have to do with it most days.
It's one of my favorite "teach someone AI development" tasks. Almost everyone has some feature they wish existed in a task management app that doesn't line up with any current project, and building your own is so helpful!
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.
I did the same thing. For years I've managed tasks, deadlines, and habits in orgmode. It works well, but I can't always live inside Emacs. So I vibed a desktop and mobile app that checked all my boxes. It'll only work for me and my weird and ancient org-agenda file locations, but has become a game changer for me. No more fighting with systems I don't understand or unneeded features.