I'll take a stab at explaining what happened here: "No swap in production" probably stemmed from someone who worked on the servers, and that person discovered they were swapping too much, which would eventually lead to hard drive decay. And, maybe for budget reasons or whatever, they decided to make it a policy to disable swap, rather than increase RAM or change the underlying software that caused the servers to use…
Swap causes not disk decay but performance decay; the system gets unamanageably slow and would have been better off with a clean crash and failover.
Like everything swap has to be monitored and there’s no need To disable it entirely