The reason for this is because swap does a lot a small read/writes on the disk, and (because this process was never optimized for SSD) uses the same sectors a lot. This is not a problem for ordinary HD's, but in the case of SSD's, this would mean certain memory cells would wear out faster
Exactly backwards, that "explanation".

On a mechanical HDD, the same sectors do get rewritten over and over in swap space. On an SSD, they don't, because the SSD firmware is continually doing "wear leveling" to prevent it.
Cheers
Yes, this is exactly what I wrote further on in my explanation:
More recent SSD's firmwares contain specific algorythms that try to write to all the cells of the SSD an equal amount of times, while also trying to avoid certain cells getting written more to than others.
Maybe I should have stressed better that this is only the case for more recent SSD's. The first models didn't have this "wear levelling" feature. That "don't put swap on SSD's"-warning also originated in that pre-wear levelling era and is not such an issue anymore nowadays.
But you knew that, of course.
