My sister is older than me and would often go off, so I grew up alone in a sense. I had to amuse myself and developed a wonderful fantasy world and quite happily lived in it. I think, in adulthood, that helped me. I love pottering on my own.
Consequences of linear thinking in Afghanistan and Iraq included overestimating indigenous forces' capabilities, underestimating the enemy, and the associated expectation that the coalition could soon reduce force levels and shift to an exclusively advisory effort.