And yet if you understood the story at all, you'd know he wasn't a "wizard" in the D&D sense in the slightest! He's an angel in the D&D sense. This isn't up for debate. Claiming otherwise isn't a "valid opinion". It's just not understanding really clear stuff in LotR and Tolkien's writings.
If you think D&D wizards should be an angels and the servants of gods, well, fine, but say that.
You also suggested "magic is supreme" is a theme of LotR, when the EXACT OPPOSITE is the theme of LotR. This suggests a profound lack of comprehension of LotR. A book you yourself have pointed out is foundational to modern fantasy. It is. And theme is PRECISELY OPPOSITE to what you think it is. Again, this isn't up for debate - this is a basic issue - this is like you thinking that Romeo and Juliet is about how gang violence is AWESOME AND COOL, or how The Tempest is about BADASS WIZARDS and casting awesome spells!!! or something. God or Frankenstein is about how we should be doing the wildest and most insane experiments possible and nothing will go wrong!
Tolkien's universe is actually quite low and/or subtle magic compared to D&D. The theme of The Hobbit and LotR is that the (literal) little guys are the true heroes of the stories. Tolkien considered Sam the true hero of LotR.