Any downside to mount -o noatime?

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I'd like to reduce the wear-and-tear on my SSDs and eliminate the unnecessary metadata writes on my backup media that only slow down the backup process. So I want to add noatime to all my mounts. Is there any downside to this?

At one time I remember atime being useful for tmpwatch, which removes files in /tmp that haven't been accessed in a week or two. But I can live without that feature.

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