Many of these are already implemented in Lemmy, others are too controversial and wont be added (such as karma).

We are currently preparing the 1.0 release which will have lots of major new features, such as private communities, multi-communities and much more. Although 0.19 is also getting constant updates with smaller improvements, for example 0.19.11.

Can you say which mod tools Piefed has that are missing from Lemmy?

Im not familiar with Wikidata, but with enough development time it could probably also be recreated as a Fediverse project.

Keyword filtering is about to be merged into Lemmy. Other features will also be added over time.