Of those distributions, only Fedora sets SELinux to enforcing by default. Moreover, AFAIK Fedora (and RHEL) are the only distributions that had wide-scale testing of the reference policy [1] [2]. So, if you enable SELinux with the reference policy on the other distributions that you mention, it is likely that you will run into all kinds of issues.
[1] https://github.com/SELinuxProject/refpolicy
[2] https://github.com/fedora-selinux/selinux-policy