Where are you seeing the recommendation that SELINUX shouldn't be used? The documentation for Magento1 talks about how to install with SELINUX and says that they don't recommend to have it or not. http://devdocs.magento.com/guides/m1x/install/installing_install.html#install-prereq-selinux
Ok my bad. I read here on the forums that a lot of people have SELinux disabled and just wanted to have new users the risk of doing that.