Oracle BI Publisher is a part of the Oracle BI Enterprise Edition Suite
Oracle BI Publisher separates the creation of data from the process of formatting it for different uses.
Oracle Business Intelligence Foundation Suite (OBIEE) is a complete, open, and architecturally unified business intelligence system
for the enterprise that delivers abilities for reporting,but ad hoc query and analysis, online analytical processing (OLAP), dashboards, and scorecards.
So, Oracle BI Publisher main destination (IMHO) is data formatting (different templates , printable forms) for different uses.