Apple's current strategy for security fixes is "update or die". They now support only the latest and greatest OS on both desktop and mobile, with no "enterprise" exceptions. If you don't want to get owned, you have to use the newest OS that may have added/removed features that you may or may not want. MSFT is still supporting Windows 7, 8, and 10.
See it's really funny that basically everyone upgrades to the very latest release of OS X shortly after its released. You never hear too many people complaining that Apple put out a new version and is "forcing" you to upgrade. People just do it. They just upgrade. The only complaints you hear are from people who are locked out of the upgrade because their hardware is considered too old for the new version. People complaining that they can't upgrade even though they want to, huge difference from the Windows world.
Yet every time Microsoft puts out a new version, even fairly minor revisions like Windows 7 or Windows 10 where the hardware requirements stay the same, there is a major backlash and a huge furor and everyone insists they will stay at the older version until they die.
Apple's current strategy for security fixes is "update or die". They now support only the latest and greatest OS on both desktop and mobile, with no "enterprise" exceptions. If you don't want to get owned, you have to use the newest OS that may have added/removed features that you may or may not want. MSFT is still supporting Windows 7, 8, and 10.