Its okay that high elves is alot taller then nords and alot taller other playable races because they are fantasy race, and because there is other elves.
But I think nords should same height as dunmers,imperials,bretons, and khajits, because making nords taller then others in cold badlands terrain like Skyrim is anti-realistic, and if nords is inspired by ancient viking culture they should look like ancient vikings and not like people from 1960-2012.
Also when u playing non-nord and non-high-elf character in Skyrim u feeling like gnome in the land of giants, what is a bit unfair. Especially when u are dark-elf or khajit and random nord npcs making racistic comments on your character