What does it mean that digital and analog are both valid?

Choose capture tools based on what you will actually use, not what seems most sophisticated.

Example: You buy a premium leather notebook because handwriting 'activates deeper learning.' Three weeks later it sits unopened in your bag while insights evaporate because you didn't want to pull it out on the subway. Meanwhile your colleague captures everything in phone notes — messy, unformatted, but actually used. Six months later she has 400 raw captures feeding her thinking system. You have a beautiful empty notebook and a vague sense that you used to have good ideas.

Try this: Run a 7-day capture audit. For days 1-3, capture exclusively with your analog tool (notebook, index cards, whatever you own). For days 4-6, capture exclusively with your digital tool (phone app, voice memo, desktop note). On day 7, count: total captures per medium, captures you actually returned to, and captures that produced a downstream action. The numbers will tell you which medium matches your life — not which one matches your aspirations.