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@dubtap
6800/9000 weight diff comes down mainly to the £150 titanium DA freehub vs £30 Ultegra one which is another consideration when looking at spare parts etc.
They have the same cone spanner free adjustment now too which was the tech upgrade between 6700 and 9000 as well as the 11 spd thing.
My 7800 hub seals also seem to impervious to ingress of anything at all having been ridden in all weathers and every time I've opened them up the grease has been as new and that's 5-6 years ago I built them. Don't know how Ultegra compares.
Also angular contact bearings fo lyfe.