I think what the author was trying to say is that every person is the wrong person to marry if you judge them by your expectations of what they should bring to the relationship.
I think interpersonal relationships is one of the places where it matters most to have expectations and standards. There will be trade-offs, but at the end of the day you need to be able to add to someone's life and vice versa. This whole low/no expectations thing can keep people in some pretty toxic situations. And if you have expectations, you also need to be able to extend yourself to meet the expectations of others. Its give and take.
This whole low/no expectations thing can keep people in some pretty toxic situations.
It's not really about low/no expectations. It's about not letting smaller, less important things impact the larger, more important things. So, one person sometimes not putting down the toilet seat could either be a momentary frustration that is sometimes mentioned but largely ignored, or used instead as a catalyst for arguments and an example of how that person is lazy and uncaring.
This was the expectation that the author believes makes everyone the wrong person to marry: that a perfect being exists who can meet all our needs and satisfy our every yearning