I think digital sticky notes have a use but it isn’t for reminders. At work we use Miro and the sticky notes for group planning. It’s very effective to have everyone sticking ideas in to a board and being able to arrange them.

But I agree with everything you said. I moved away from check boxes in a notes app where everything had its own page and now I use a physical note book where everything is time sequential rather than sorted in to topics.

Now I never forget anything as it’s all on one page sitting on my desk always.