I am certainly not surprised to see people holding different views, and sometime could be quite different. The purpose of discussion is not try to uniform people's mind, but to expose the diversity.
I only read couple of lines here and there. Let me just pick on one thing I have read:
"First the trivial. Let's take something simple, like day and night. They are different, aren't they? Well, where do you divide the evening between them? "
My OO view is that, time is a class. It has certain properties like year, month, day, hour, minute, and second. Different point of time is just an instance of time, which holding particular property values. Day and night, or the line between them is unrelated here. There is nothing make me feel the need to perceive day as a class, and night as another class. or even day as an instance or night as another instance.