Categories not included?
Does this really not contain articles' categories? These are some of the pages most valuable useful metadata. Or have I just missed something?
You are correct that categories are, currently, not included in this dataset. However, they are included in our existing Wikimedia Enterprise ‘Snapshots’ API (and in other existing services - https://www.mediawiki.org/wiki/API:Categories ).
As described in the data-card, this is a first Beta release, so it's good to hear feedback about what people find useful but also find missing for their use-cases. Thank you.
For your interest, you can follow the technical updates for all the Enterprise API development (including but not limited to this, the ‘structured contents snapshot’) on-wiki here: https://www.mediawiki.org/wiki/Wikimedia_Enterprise#Updates . Thank you.