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Roger, I own a tripod that extends a full 30cm higher than I reach, the Gitzo 3542XLS. Why? Because on a slope, one leg gets extended more than the others, and, if you want to keep a full-height tripod in such conditions, and slopes often need tall tripods to avoid unwanted foreground, a tripod taller than you is the way to do it.
And most of the time, I just extend one section only, or two sections, depending on the shot I want to take.
There is of course a weight penalty in so doing, but you indicate that aluminium is OK, so that does not seem a primary concern, but, conversely, a rigidity and stability gain, and a time-and-motion savings when you don't deploy the last, thinnest, section.
So choose the "right" tripod, and don't mind the extra height. If anything, choose one where not extending the last section gives you exactly the right height, which will make your life comfortable in most cases.
Hope this helps