Some folks force every line to be Jason serializable. That can be nice for not needing to rewrite a parser for structured log lines. Another case is if you pri

Some folks force every line to be Jason serializable. That can be nice for not needing to rewrite a parser for structured log lines. Another case is if you primarily send data via messages between processes, you could save those streams as log data. For example tcp streams or protobuf. The binary formats will be faster and smaller than converting all log output to text. While these scenarios may not apply to the common case, they certainly exist within the field.