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The benefit of this approach is that future record types are deleted. The proposed approach to ignore new records only works because the coordinator deletes new record types when a group is converted from new to old. However, we may introduce new record types that are not deleted during this conversion (this KIP proposes to enforce that new record types are always deleted during group conversion). Another benefit is that there are no strict requirements for the OffsetCommitValue record. We don't have to only add taggedFields (which this KIP requires) since these records will be rewritten anyways. Having the upgraded coordinator explicitly rewrite new record types and downgrade is future proof and there are no version downgrade barriers like we do for the proposed design.