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Ooh, interesting — this can unlock a few new system designs:
You can append data to the end of existing objects stored in the S3 Express One Zone storage class in directory buckets. We recommend that you use the ability to append data to an object if the data is written continuously over a period of time or if you need to read the object while you are writing to the object. Appending data to objects is common for use-cases such as adding new log entries to log files or adding new video segments to video files as they are trans-coded then streamed. By appending data to objects, you can simplify applications that previously combined data in local storage before copying the final object to Amazon S3.