With the concerns stated in the article, I can't see any benefits to adding swap vs adding an equivalent amount of ram. The author mentions that not needing swap due to having more than enough ram is a common misconception, but I cannot see how that can be. For any given workload, you could replace the useful amount of swap for an equivalent amount of additional ram. Sure some pages cannot be reclaimed, but the amount of anonymous pages that can be reclaimed is limited by swap size. In an alternate system with more ram instead, the pages that would be in swap instead are locked in memory, but this does not give more useful memory. More ram would be more flexible as it allows more cache than the swap scenario when you dont have swap full of pages. Thus we can conclude that there will always some amount of ram that is sufficient, and therefore if your system has enough memory that you dont face memory contention, you don't need swap.

If theres a better explanation for why swap is useful, I'd like to hear it, but the article is unconvincing.