Technology moves constantly and certain software or operating systems are either upgraded or become obsolete when a replacement comes along.
Keeping your server up-to-date is the best way to ensure you have the latest features as well as ensuring security patches have been applied.
It can be daunting to keep track of what versions and software are supported and compatible with cPanel & WHM, as such, we made it easy to keep track of this by creating our "Deprecation Plan" which shows what versions of cPanel stop supporting software or Operating Systems.
This is constantly updated to reflect our future and past plans in regards to software support.
Check out the full list here.