After giving it some thought, I have decided that "Sentence case" is superior to "Title Case" from the viewpoint of precision. By capitalizing words in headings and titles of publications (of which there are many different ways to do it!), information is lost as to whether a particular word was a proper noun or not.
Furthermore, there are words (capitonyms) that completely change meaning and possibly pronunciation depending on the capitalization. For instance, "polish your shoes" vs. "eat a Polish sausage", or "measure the mass" vs. "go to Mass".
Using title case is a lossy operation.
Dunno. Has he stopped beating his wife?
Just because he hasn't stopped doesn't mean he ever started.
Ya'll hear about the geometer who went to the beach to catch some rays and became a tangent ?