You could make a similar argument about the redundancy of JSON or even XML too. S-Expressions predates all of them and can represent any of their data structure

You could make a similar argument about the redundancy of JSON or even XML too. S-Expressions predates all of them and can represent any of their data structures too. The problem is S-Expresssions is still pretty niche where as JSON support is widespread and supporting jsonlines when you already support JSON is trivial. If you’re old enough to be a LISPer then you should be old enough to realise that there’s always going to be a multitude of competing standards and sometimes we have to make pragmatic choices.