There are suits and there are casual suits, there are dress shirts and there are casual "dress" shirts. IMO, you're being too simplistic when you say that a dress shirt is appropriate for every suit.
Again, I wasn't questioning your taste, I was questioning your logic on choosing one over another and you answered that it's simple a question of what you like with no logic behind it, so I got my answer. Thanks.
My boss wears button down shirts 80% of the time. He wears a suit 100% of the time. I've gathered that SF is mostly anti-BD "dress" shirt (at least with a suit and tie), so do his choices make him wrong? No. Is it my style? No. But that's what he likes, and it's not what I like. No logic is needed.