Maybe we can talk about ways context should be changed?

I still don't walk into a store with my phone and then quickly walk out with exactly those items I predetermined. Occasionally I will use my phone as a list, but a small piece of paper is easier to reference while in the store. I don't ever see anyone else doing any better and most never use their phone or any other device.

I think this means that we do not yet have true personal computers.

What might be the most important context to change/solve?