You may be right. I may have misinterpreted it. I read it as he was using his calendar for unscheduled tasks. If so, I would consider that bad practice. Obviously, scheduling time to think about a project is appropriate, similar to my example of scheduling time for strategic planning. Link
GTD: Get Things Done.
OBTF: One Big Text File.
Definitions:
Appointments
Tasks
Ideas
Thoughts
People
Meet to
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