@blckhwk let's wait a developer reply.
About Centos 8 is relevant if you have a server security vulnerability but is your choice ignore this, mine is just and advice, this never deny you to choose to keep your server vulnerable.
Is just an advice that I given to you, same thing for PHP.
Is your choice still use old software that is deprecated so you can have security issues.
PHP 7.4 is supported but will be soon be deprecated as well.