This has already been debunked multiple times now. You are unbelievably dense. Firstly, Titans don't create arcane magic, arcane magic is what titans are made of. Magics like arcane don't come from a deity, they come from their respective planes of existence. Arcane specifically comes from the plane of order. And before you start saying crap about Elune being bound to the light cosmic force, she has displayed some form of power in Light, Life, Shadow, and Order.
Secondly: https://wowpedia.fandom.com/wiki/Arcane#Druids
It clearly states that by calling upon the sun and stars they are able to use ARCANE magic, NOT astral magic which has been clearly and separately defined on several occasions.
Provide me with one single source that isn't you making shit up that says balance druids don't use arcane magic