tl;dr: Turbopuffer is rearchitecting its storage in v3 to stop using the ANN vector index as the primary key, which has caused storage amplification (duplicating docs for multi-vector cases), write amplification (rebalancing cascades), and suboptimal block sizes for non-vector queries. The new design treats ANN as just another secondary index, enabling faster text, regex, vector, and SQL-style queries. V3 currently passes 100% of CI, with performance tuning and public benchmarks coming before production rollout.