Section V - small changes

This commit provides mostly small changes. There didn't seem much point in
repeating the `lessons learned` jargon and claiming that we draw good
conclusions - insights - from our experience.  Better just state what
hypotheses we have generated from the experience rather than give the
misleading impression that our hypotheses are well-established facts. In
the comments, I put a suggested translation of what the `lessons learned`
jargon means. I seem to have first heard this term in the mainstream media
a few years after the US 2003 attack on Iraq, when a US military
representative stated that the US forces had "learned lessons" after having
started a war of aggression against Iraq.

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