So the other thing about using index cards is that it's incredibly flexible.
In my case: I'm a decent home cook, but I struggle with meal planning and groceries. So my solution here is to create tiny recipe cards I can assign to specific days, and as I assign them I can list what we need to buy from the store.
But this doesn't just work for meal planning, you can do the same for workouts, music practice, hobbies, and so on. Anything recurring you want to make time for!
Right now it's taking a lot of time to setup. But that's more or less expected. The idea however is that once it's setup it'll save time overall.
What's also nice is that by having this in the physical space I can also work with my partner on this. Maybe I make the meal plan and they do the groceries. Or I let them pick what they want to eat and take it from there. Stuff like that!
And that's much harder to do when things are purely digital or even linear like with a notebook.
yosh