Classic plain text log files are structured too - they're files of '\n'-separated records, without much else to it. It doesn't really matter (integrity-wise) whenever one's writing, say, JSON or mostly-unstructured plain English records.
I'm unaware on particular journald internal implementation quirks and issues. Maybe it's badly coded and has lots of bugs that corrupt data. That would be implementation issue. But the overall idea of using "binary" logs isn't that bad to me.
Classic plain text log files are structured too - they're files of '\n'-separated records, without much else to it. It doesn't really matter (integrity-wise) whenever one's writing, say, JSON or mostly-unstructured plain English records.
I'm unaware on particular journald internal implementation quirks and issues. Maybe it's badly coded and has lots of bugs that corrupt data. That would be implementation issue. But the overall idea of using "binary" logs isn't that bad to me.