That's true - neither of the three data lake formats has good C++ or Rust libraries. We have to support all of them (Iceberg, Hudi, and Delta Lake) in ClickHouse, but afford it only for reading. The overall data lakes infrastructure is fragmented, the language support is sketchy, and the details often change in incompatible ways.
Note that s3 does not support the atomic "create object or return an error if exists" operation, and it makes it questionable how the formats can correctly work for concurrent writes.
