The website could use a comparison / motivation in comparison to Parquet (beyond just stating it's 100x better).

Agreed, really need a tl;dr here, because Parquet is boring technology. Going to require quite the sales pitch to move. At minimum, I assume it will be years before I could expect native integration in pandas/polars/etc which would make it low effort enough to consider.

Parquet is ..fine, I guess. It is good enough. Why invoke churn? Sell me on the vision.