Load datapage option mentioned in Setup section is more like a support tool, and not for datapages referenced in Rule under test. Usecases like retrieving data from database/calling a rest-connector, and use that "data" as input for other rules can be easily done if we have datapages present to do such job.

Also, activity rules have a page-remove step, using that some important pages are remvoed from clipboard towards the end of RUT run. If we have datapages, that can retrieve that data from database, we can still assert on those objects if we load the data using Load-Data-Page option.