unlucky Some people just like writing and using a paper system. It orders things in their head better. Writing things down can often improve memory too.
The duplicate writing, eg migrating tasks lets you priorotise and decide if you really need to do that thing. The ideal being you don't need to migrate much as you have been organised enough to get it done. Plus on the re-writing of the list, you reflect more about what you are doing/have done that you would pressing a button on your phone (at least I do).
I've added pages for tracking food and exercise, but doubt I will actually use them as I use MyFitnessPal and Runkeeper to track these religiously already, but for my to do list, I've tried aps but don't get on with them. There is something very satisfying about crossing something off a list.
I think how you organise yourself is a very personal thing and not every system will work for every person. I buy a diary every year, usually week to view, but hardly ever use it. Since I switched to this method, I don't have vast parts of a book unused.
It is also useful for more than just a calendar/schedule/to do lists and a lot of people journal in it as well, use it for inspiration notes or sketches if they are an artist and for a million other things. This is just a way of keeping that all in one place.
I see these artsy decorated ones online and they are all well and good, but really, I'm just not that sexually frustrated that I feel the need to channel all my energy into it. I do however want to remember what I need to get when I go to the shops.