Why do we throw exceptions in the ConfluenceRpcInterface methods?

Hi, If our goal is to implement the Confluence XMLRPC interface (http:// confluence.atlassian.com/display/DOC/Remote+API+Specification) then it seems to me we shouldn't throw XWikiException in any method in our ConfluenceRpcInterface interface. Several methods instead should return a boolean to indicate success or failure. Does anyone know why we're throwing them? Are we ok to remove all exception throwing? Thanks -Vincent