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Probably higher cost to send 2 notifications to the user compared to always fsync on all writes in a SSD.

+1 - I have found its better to instead use it on paths that you know are idempotent and recoverable. Liking expiring data on a cron and so on.

The network is faster then the storage.

No it isn't and hasn't been for quite some time and it will probably remain that way for the rest of our lives.

It still doesn't matter. All you need is enough CPU cycles to send the additional completion notice.

With nearly all DBaaS, and _especially_ Aurora, as TFA mentions, the storage is also on the network, so it's moot.