Even though Apache 2.4 is available for a long time. Switching config might be easy on the config files itself. But inside code it can be harder, since that code might has to work on both versions. Developers often use .htaccess files. That is not recommended for performance, but a quick easy way for testing and development.
One solution is to use a .htaccess file that supports both versions.
<IfVersion < 2.4>
order allow,deny
deny from all
</IfVersion>
<IfVersion >= 2.4>
Require all denied
</IfVersion>