Most of your examples also increase the damage from Physical attacks, not to mention that the theme of a Warrior of the North is very evident in the old and new talents.Which is a theme that prevail to these days, while also making references to the stark familiy in game of thrones, which is know to live in the North.
-Tundra stalker
-Blood of the North
-Merciless combat
or the one thing that is key to the Frost Dk
-Killing Machine.
The Frost Dk theme and play style mirrors a warrior of the North rather then a undead spellcaster.