A lot of marriages are this way and do fine. A diverse but comprehensive worldview is helpful when operating as a singular unit. You can be smart and ignorant at the same time in some ways, and that's okay.
No they are not, most marriages are not between people with that different IQ. Most people are not that different even. What a weird thing to say.
It’s more like “fundamentally perceive the world in a different way”, and generally leads to a lack of empathy towards the other group due to this difference of perception.
This is one reason why, at least until recently, US generals were not known for their high IQ.