It's like arguing with a brick wall. Nothing you are saying means Vanya is bad, or that nobody should ever use it.

In comparison with AF2/Allagan, Vanya can have:
-9 MND
-9 VIT
-2 Spell Speed
+20 Determination
+24 Critical Hit Rate

Not exactly unequivocally better, but no where near "useless", "senseless", or a "bad choice". You don't seem to understand that you aren't locked in a single type of gear... I'd love to give you a some examples where obtaining HQ Vanya would not only be the right choice, but it would be the BEST choice but I'm afraid the sentiment will bounce right off of your ignorance.