As BluRay is all over the map and subtitles may or may not be done in a standard way, the fault, and this is my view on the issue is the BluRay industry. They work hard on DRM, copy protection and more that the basics are lost. I don't have a lot of BD titles and don't foresee adding any more.

Item 3. Another deep question. Good one. But as folk will debate endlessly that a setting is better than the other you won't find any clear answer there. If something was clearly better, why would the makers offer the settings at all?
Bob