On the scale of sizes visible to us and especially understood by us, i.e. grain of sand vs. Mt. Everest or an atom vs. the span of our galazy, for starters, the difference between 6'4" and 5'6" is pretty insignificant.

I've known people 6'8" plus who did not appear to benefit at all from their height, quite the contrary.

One guy who drove cab in SF must have been 7'2" or more. Poor guy did not have the overall balanced physique of say, Wilt Chamberlain. His ankles were weak, he walked poorly, hunched over. Must be hell queezing into a car and flying on an airline is almost out.

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1986 300SDL, 362K
1984 300D, 138K