Wow – this is a great question!
Yes, girls are very idealistic, and they also don’t really “get” how boys spend hours upon hours talking about the same topic and how exhausting that can be. (Girls learn for hours a day, too, but we get to have different subjects, not just Gemara.)
If both boys and girls go into shidduchim knowing that these differences exists, and boys are honest yet sensitive to how the girl is going to react, then by all means he should be open. If he’s a mensch, she should accept what he has to say.