I like EE from an academic standpoint, but I do have a problem with the exact thing you are questioning.
Source title can have various data points depending on the object being sourced. For published works it would be the actual title, for example the book or article title. For unpublished works it gets a little hairy!! For sources that involve a "happening" like an interview or letter I would have date, from person, to person, "interview, Jan 3, 1975 of John Doe" for a census I would have something like "1910 US Census, location..." The hairy part come in asking yourself when to stop with the "location...". I like to keep my source records generic so I stop with the state level and report the remaining detail in the source_citation.page field I.e the citation-detail.
The citation-text is for storing the actual text that you are citing. This is mostly for information that comes out of a book but could be used in other things as well. Remember the source-citation is for keeping citation specific data not for data about the source.