My goodness DaddyJ That looks like a poem.
I'm not sure I'll be able to respond to all your points in one go as I only MN when bfing (which as you can tell is fairly often though).
CC is done by parents who want/expect their babies to fit in with when they themselves would like to sleep. This isn't when they HAVE to sleep, but how they set up their days/weeks. It is their lifestyle.
On what premise did you decide that your daughter needed guidance to sleep? Or was it rather that you wanted her to be guided to sleep to fit above lifestyle. I certainly believe that her sleeping wasn't what you wanted and you proactively sought to change it.
If I were to want/desire my babies to sleep according to above lifestyle, THEY would need training, so I'm not saying mine don't, rather that I am happy for them to find their own patterns.
I do believe however, that infants do eventually learn to follow the 24 hour pattern that our culture expects, but 'fitting in' with the parents and their sleep cycles. As social animals they learn to do what is necessary to be accepted. Why do I believe this? Sleep training is a modern thing, babies and families survived prior to this 'invention'.
I believe your daughter settled herself at 7months, but it is not possible to say with certainty that cc was responsible for this or that it would not have happened anyway. You refer to 'the situation you were in'. Could this have led to bedtime anxiety on her part? Not saying it did. I have no idea of your circumstances.
I don't understand the last verse of your poem.
I do know that being a parent in the first year in particular is very very hard, and that we are no longer set up in a way for babies who take longer to sleep well to do so in their own time.
I do think it is only a matter of time and that being tired creates the biological need to sleep, as being hungry makes us eat. It is only as our consciousness develops that we are able to over-ride these needs i.e in anorexia.
BTW I completely made up the last paragraph.