It's not just that Tidus is lost and confused. That's understandable to a certain degree. What isn't understandable is some of his other issues. I get the guy had father issues, but they're just taken to soap opera levels of ridiculousness in FFX. I also get that he's supposed to be the audience surrogate and intended to ask questions about how Spira works so the audience isn't confused, but some of the stuff he's confused about is just ridiculously obvious regardless.