After reading the document, I think "proprietary block format" is a design. Obviously this design can provide parallel data flush back to S3 quickly, and we can

After reading the document, I think "proprietary block format" is a design. Obviously this design can provide parallel data flush back to S3 quickly, and we can cache the reading block and prefetch the next block for more cache friendly. Seems that JuiceFS have S3 gateway, so you can still access the files in S3 protocol.