The bland dialogue box does bother me, but I think in a much different way than it does you. I agree though I'd very much like to be able to move and re-size it!

On top of that though, I'd love if they put in some classic JRPG flair and threw a little facial representation next to the box to show who is talking. Seems kinda silly, and I am sure there is little demand for such a feature lol, but I would actually be much more excited to read all the NPC dialogues this way