To the very end, we never saw his eyes even once.
Incorrect. We saw his eyes exactly twice. I just binged it in one go so I kept it in mind.
The first time was when he was being real and made her open her heart to him.
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Chapter 10.
The second and last time was during his confession.
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Chapter 55.
It kinda adds more meaning for his eyes to be visible only during important moments.
And I kinda got a theory going, where this trait of his is genetic, since his sister was the same. Something that adds credence to their world working like that is that Ichigo inherited her mother's constitution.
And if that's true, here's an even wilder theory. Ichigo may actually have another sibling that inherited her father's faint presence trait. Evidence to that is that their dining table is set up to host four people. That sibling could either have moved out already or maybe they were actually there, observing next to the father.
I know it's a long shot, but there's nothing to contradict it, so I'm choosing to believe it's real.