Great question Merlin. I think that there’s a deeper connection between GTD and David Allen’s quest into buddhism. If one looks at GTD like they would, say a yoga practice, or a meditation and mantra, they’re each a set of activities that, when done regularly, result in a positive, balanced state of mind and body. Productivity might be one result, but that’s looking at it from a pretty simple perspective, just like someone looking at yoga solely for the health benefits. The yogis had way more in mind than staying flexible when they came up with the practices and poses that make up hatha yoga and pranayama breathing.