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  1. Maintain support for message formats 0 and 1. Message format 2 is required for correctness (KIP-101) and key features like idempotence and transactions (KIP-98).
  2. Keep read-only support for message formats 0 and 1 when it comes to on-disk data to avoid forced conversion to message format 2 in Apache Kafka 3.x and later. This has some appealing aspects, but it would mean keeping all the code for handling older message formats for a long time. The benefit doesn't seem worth the cost given that message format 2 has been widely supported by Kafka clients for years.