Your question is answered in the design doc at https://docs.google.com/document/d/1RNHkx_VvKWyWg6Lr8SZ-saqsQx7rFV-ev2jRFUoVD34/edit?pli=1#heading=h.nvk2biis6bpk

Your question is answered in the design doc at https://docs.google.com/document/d/1RNHkx_VvKWyWg6Lr8SZ-saqsQx7rFV-ev2jRFUoVD34/edit?pli=1#heading=h.nvk2biis6bpk https://docs.google.com/document/d/1RNHkx_VvKWyWg6Lr8SZ-saqs... tl;dr minimizing latency, particularly in establishing a connection, is an important design objective.