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The actual choice is 32GB RAM + 32GB swap or 32GB RAM + no swap. This is because people already bought their RAM and disks by the time they make the decision, and aren't using the whole disk.

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I mentioned this in a response[1] to a sibling comment, but my question is more about learning what are the advantages of swap itself, other than just cheaper slow RAM.

What does the OS do differently with swap vs RAM? What can I do with swap that I cannot do with RAM? Things like that.

[1]: https://news.ycombinator.com/item?id=49670574

Nothing besides having more of it. Apparently also hibernation, but that's more of an artificial limitation - there's no good reason a system couldn't create a hibernation file on demand.

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