The SL additions seem very inconsequential for most users. The article doesn't imho give any good reasons to use SL instead of some other RHEL clone (such as CentOS).
I'm using it on a desktop at home behind a router & so I don't watch the security updates especially.
You can add the PUIAS 'addon' and 'computational' repositories to a CentOS desktop with appropriate use of yum-priorities.