Whole PGM content library (RT's, RD's, MIDI, Styles, Songs, etc.) had been consolidated into single non-modal tabbed librarian.
You can try out items in near real time without opening and closing picker dialogs.

"What does the latest version of Band in a Box have to offer in the scope and integration with the modern recording/production platforms available today?"

Well, this question could have many answers. For one, unlike AI stuff that is likely stolen from copyrighted sources and to my understanding can't be copyrighted, BIAB offers ethical way of writing tunes, as PGM musicians were paid for their work... To try to answer your question more directly, in my opinion, a combination of a new Track View and Partial regeneration are the strongest combo of features in the past few years. You have significantly more control over tracks now.