Considering the last distro upgrade had Apache going from 2.2 to 2.4, which introduced considerable changes to the config file format, "upgrading the servers" is not something that can be done in _all_ cases.
But that is an issue with Apache and not really a Distro issue. I'm thinking I didn't have to change anything on my Apache config since mine is very vanilla.
So if you have a vanilla config on Apache it still works.
