Write-optimized data structures are important because a lot of times hitting the writes/second limit means rejecting wires and losing data. If you’re thinking

Write-optimized data structures are important because a lot of times hitting the writes/second limit means rejecting wires and losing data. If you’re thinking of putting a large write queue/buffer in front of the database to avoid losing data, well an LSM tree is one way to implement that. And since you can query it, you might not need a full database anymore. Read caches that lag behind the ground truth can do the job.