Sure, the question is why fix something that is not broken? Why should someone write a systemd journal format reader (but journald is just an example here) when text files work already? Why rewrite tools to support it?

If you get to the point when standard unix tools are useless, well, it's time to use a _real_ database and/or log management system. Not the time to write your own. No one is (should be?) going around grepping 100 GBs/day worth of logs.