I'm admittedly really confused about Arguis. His first post made it seem like his powers were much more limited, where he could just think of something and instantly get the answer but not simply be aware of literally everything that there is to know and process all of this information at once. It was also mentioned that he could know some things, yet still not understand them, which further reinforced that interpretation.

Yet I've heard people refer to him as literally omniscient, as in he knows about literally everything that's going on. That seems OP to the point of absurdity, as he'd be impossible to beat in any way. There could be no hiding or disguising anything, and knowing everything would also imply that he knows the thoughts of others and could therefore dodge or counter any attack as he'd see it coming.