But the requirements were to allow filters to be configured on users and groups, which would require more info in your data structures. This doesn't meet the specified requirements.

Plus even with it not meeting the requirements, it is confusingly presented, and is filled with terminology related to the implementation rather than the domain. Where's a group definition? How would you configure a filter for a group? Or a user for that matter. (Answer: you would require a much more complex data model, and functions to access and modify it).

I'll stick to OO for the top level paradigm I use until something better comes along.

OO being dead is fake news perpetuated by ignorant know-it-alls.