for enchanters hide makes sense because it's an easy way to end charm on purpose so that may be why you see dark elf enchanters - plus enchanters can become any race they want anyways.
for wizards it can make slight sense because hide is useful while medding afk without having to worry about invis dropping prematurely. also invis has cast timer/mana cost
for necros it makes sense because you're evil anyways, might as well go all out
for mages it's just stupid
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