The Wikipedia article claims that in Book II a decent number of the minor-key pieces end with a minor triad, a departure from only a small minority of them ending that way in Book I.
Maybe they weren't cooked correctly? I've had impossible burger many times, and it always looks light brown like a McDonald's burger when cooked. Tastes like one, too (which I enjoy).
I suspect this story starts long before the author and their wife discover they have nothing in common. These (marrying before realizing incompatibility, then the obsessive all-or-nothing relationship with their direct report) sound like behaviors of someone who uses relationships to fill holes. I didn't really understand this about myself until starting therapy 1.5 years ago. I hope the author sees a good therapist. You deserve to be happy.