[mmarx]

> Neither is it possible to query for history of changes over the triples.

And why should it? The triples (and hence the full RDF dump as well) are a “lossy” (there's actually two different translations, the “truthy” triples that throw away large parts of the data, and the full dump that reifies the full statements, but is therefore much more verbose) translation of the actual information encoded in the graph. Revision history for the _actual_ items has been queryable via the Mediawiki API for a long time.