Even for a tech enthusiast like me, this thread is getting too complicated and technical for most. It's hurting my face. Whether WOW64 mode is an emulated environment that may potentially decrease performance/use more resources compared to a native 64 bit programs is and should be left on another forum, not one for XIV. Especially since it seems different people are having different understandings of what this technology is and does. SO please take this to a tech forum to sort these things out. I can assure better and more technical results there.

I think ultimatly the OP's question should be:
"Do you think that ARR will have both a 32bit and 64bit client, or will it only be 32bit?"