I'd rather work with someone that prefers a format, but doesn't write articles like this. It's fine to "prefer" parquet, but CSV is totally fine - whatever work

I'd rather work with someone that prefers a format, but doesn't write articles like this. It's fine to "prefer" parquet, but CSV is totally fine - whatever works mate. When you hit the inevitable "friends don't let friends" or "considered harmful" type of people, it's time to move quickly past them and let the actual situation dictate the best solution.