“Wherefore art thou Romeo” isn’t confusing to modern English speakers because of the archaic “art thou”, it’s confusing to modern English speakers because it ac

“Wherefore art thou Romeo” isn’t confusing to modern English speakers because of the archaic “art thou”, it’s confusing to modern English speakers because it actually means “why are you [named] Romeo [implicitly, Montague]”, the where- prefix has nothing to do with location. It’s extremely common for modern speakers to be unaware what wherefore means.