No, it is completely irrelevant because we're not talking why one class has one ability while the other class has another. We're talking about the
differences between their abilities.
And Black Arrow's secondary ability would also activate when you kill an enemy. "Period". Black Arrow, however, has the advantage of also dealing extra damage, so it's not only useful when the mob dies.
I'm not talking about the hunter's version. I'm talking about the
dark ranger's ability.
And if you have no more enemies to fight, you don't really need the minion you get from killing a mob with Dark Arrow.
See? Same thing.
Except you are, since the requirement for raising an undead skeleton is that the mob dies
while affected by Black Arrow, which is a damage-over-time debuff.
A dark ranger would not charm beasts. The concept is not about charming (or taming) beasts. And as for restriction, I'll remind you that the mage's polymorph spell did not have as many restrictions as our current spell: you could polymorph abominations, for one.
I'm making it fall in line with the concept's description in WoWpedia.
But they didn't have Black Arrow before then, and nothing in their concept or lore indicated that they should get an ability that raises undead. It's the exact same case as the tinker mech. So they could be given tinker armor, and keep it for a few expansions.
Who said they're
magical traps?
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Your first mistake was making a real life comparison. We have examples
in the game of people using of mind manipulation magic. Anduin mind-controlling Sully to let him go back in Pandaria is the most recent example I can remember. Katrina Prestor, a.k.a. Onyxia, also used mind control on Bolvar Fordragon through the Drakefire Amulet.
I'll repeat what I wrote in my last response to you:
So saying "dark rangers are just quel'dorei rangers" is a dead-on-the-waters argument.