I fail to see why integrity checking is the file format's responsibility. Is this historical? Like when you just dd a tar file directly onto a tape and there is

I fail to see why integrity checking is the file format's responsibility. Is this historical? Like when you just dd a tar file directly onto a tape and there is no filesystem? Anyway seems like it should be handled by the filesystem and network layers. I can understand the concerns about versioning and fragmented extension implementations though.