Start with a decision, not decoration
A useful planner brief names the reader, the decision or action the page should support, and the evidence required before design begins. For this project the audience is people recording tasks, appointments, goals or progress by hand or in a PDF. The working objective is to provide repeatable writing spaces with a clear rhythm and enough room for real entries. Write those two statements at the top of the brief and test every proposed section against them. Material that does not help the reader understand, trust or act should be removed, shortened or placed in a secondary channel.