I mean on the querying side. Parquet's ability to skip rowgroups and even pages, and paired with iceberg or delta can make the difference between being able to run your queries at all versus needing to scale up dramatically.
I am saying JSONL is a lower bound format, if you can use something better you should. Data interchange, archiving, transmission, etc. It shouldn't be repeatedly queried.
Parquet, Arrow, sqlite, etc are all better formats.