Single log line is 49KB+ (ext4) / 110KB+ (btrfs) of systemd-journald disk writes

A user reported that systemd-journald is causing excessive disk I/O, with single log lines consuming 49KB+ on ext4 and 110KB+ on btrfs filesystems, resulting in ~50 IOPS when writing only 2 log lines per second. The issue occurs when journald writes to disk and was previously reported but closed without resolution.