I dont get your logic but whatever...But Hunters use other mage spells as well ...
Paladin/Cleric has a separate class in fantasy all the time, but some of these ideas could easily be baked into a single spec. The whole attitude of Paladin and Warrior are drastically different, as are Paladin and Priest...
Dark Ranger - uses some magic, some ranged, wears mail/leather..
Hunters in their current form aren't all the same anyway. MM don't use pets anymore as far as I know. Survival uses magic and traps etc... Dark Ranger could easily replace one of those specs and not a lot would really change.
I'm not against Dark Rangers, I just don't think a full spec could come out of it without stealing from other classes, or just straight up copying Sylvanas.
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Did Meta exists pre-Legion? Yes. Did it get taken from another class so as not to compete with DHs? Okay then.