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Not an obsession, more a rough guide that does make sense. Clearly, not all should conform to this standard and as such many photo's I have seen are exceptional and do not. It is clear that several, are quite fond of the composition of the first shot. This would indicate, its down to personal preference.
I have a friend who is technically very capable, but for composition not particularly great. He is midway through a local photography course which has got him working with rule of thirds. His recent photos clearly show improved composition.
messiah - you have a natural ability for composition so its really easy for you to mentally compose your shot. With my own photo's I began working with rule of thirds, I feel I am now more competent with composition and look to break out of it and move forward with my own style. Working with this has been hugely beneficial.