When converting to GeoParquet it can be useful to set more row groups, for more efficient querying on large files. See opengeospatial/geoparquet#183

GDAL's is 'ROW_GROUP_SIZE=: Defaults to 65536. Maximum number of rows per group.'

Which seems reasonable, though I was doing like 20k default size for my experiments, so we could consider having the default be less - I didn't see negative effects, but something I read said if you have lots of parquet files then smaller row group size can affect the times of getting stats on the whole set. I think I have like 500 individual parquet files, so perhaps if it's thousands or tens of thousands it comes into effect?