I worked in scheduling and timekeeping industry for a little bit, when pen and paper is mentioned you think "oh it's just notes written, and some other things" but in reality it's literally whole departments storing everything in daily/weekly sheets/binders and it's like 20 people's job to keep it all in order and keep the ship running for next week.

When someone asks what the plan is for next week, the answer is normally, it needs to be written out, or I'll have to find this for you etc.