Thalassicus
Bytes and Nibblers
The "double great improvements" effect was split up into smaller effects across several policies, each associated with a particular specialist. Piety gets culture bonuses to artists and landmarks, commerce gives gold bonuses to merchants and customs houses, and so on. For people who like specialists, there's some policies in most trees, while most of the policies are still in the Freedom tree. This matches the project's main goal, particularly the 80/20 rule.