When one template or one module initiates an initial link, wikibase could record the ( title <-> entity ) link.
Link exemple ( item = id, guide = new, project = wikisource, namespace = Author )
Later, wikibase could re-use this link from the item to the modules in the page across the call of [[ https://www.mediawiki.org/wiki/Extension:Wikibase_Client/Lua#mw.wikibase.getEntityIdForCurrentPage | mw.wikibase.getEntityIdForCurrentPage() ]]
Later also, wikibase could re-use this link in other namespaces, in other projects and in other languages.
If we give to modules the wikibase item.id linked to the title:
* The module writer have not to search it.
* That is made only once for each title.
* The expensive function to find it is no more needed.
* The item.id become a part of the title and is easy to get.