• •Technical analyst Tom Phillips argues that data lakehouses often fail to deliver true interoperability despite their open-format storage.
• •Critics on Hacker News note that while formats like Apache Iceberg or Delta Lake are 'open,' the surrounding tooling remains tied to specific cloud vendors.
• •Industry consensus is missing on whether storage-level openness can offset the significant architectural complexity required to manage these systems.

Data lakehouses are frequently marketed as a solution to vendor lock-in because they store data in open formats like Parquet. However, critics argue that the platforms built around these formats often replicate the closed ecosystems of the data warehouses they replace. While storage openness is a technical improvement over proprietary legacy blobs, the operational overhead remains high for most startups. Whether these platforms will ever achieve true neutrality depends on the development of standardized, vendor-agnostic orchestration layers.