S3 readers often assume full object updates, notifications, and in many cases access to historical versions. File systems have fine-grained mutations, but they have important consistency and atomicity tricks as well. Many applications depend on the ability to do atomic file renames as a way of making a large change visible all at once. They do the same thing with directory moves. S3 conditionals help a bit with the first thing but aren’t an exact match, and there isn’t an S3 analog for the second. So as mentioned above, separating the layers allows these modalities to coexist in parallel systems with a single view of the same data. You can mutate and rename a file all you want, and at a later point, it will be written as a whole to S3.
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