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"Universal format means we are generating metadata for all three projects–Delta, Hudi, Iceberg– inside Delta," he says. "Metadata is very cheap. The expensive part is all the big data, and that's only stored one time in a format called Parquet."

So it looks like this only works for writes. 3x the metadata writes (delta/hudi/iceberg) and only 1 time data write (Parquet on S3 I am guessing). The reader code still needs to be 3 different extension to talk to all the 3 meta stores.

Hmm. that's what it looks like