We can do more in terms of detecting when either packet loss is happening or dynamically selecting parallelism and turning it up and down throughout the download to make sure the additional parallelism is increasing throughput.
It isn’t currently on our roadmap to do so, we have some other performance, tuning, and optimizations you can see in the milestones referenced on this roadmap item. Performance Tuning & Optimizations (PTO) · Issue #45 · storj/roadmap · GitHub
If you don’t have a dynamic component, there isn’t a single parallelism default that is right for all use cases, so we have to pick one.