That Snow Leopard doesn't get updated every time Lion and Mountain Lion (and Now Maverics) gets updated?
Stop the fucking presses!!!
If the boneheads who wrote TFS and TFA had been watching the firstname.lastname@example.org for the last 7 years they would see many cases where older OS versions did not get updated on the same schedule because the different OS versions are not always susceptible to the same security issues. Duh! They would have also noticed that sometimes the older OS versions got updates that the newer OS versions didn't get... because..... wait for it... the different OS versions are not always susceptible to the same security issues. Duh!
The angst over which machines move forward with new OS versions and which ones get left behind is definitely a touchy issue... Apple has never let on which machines will be abandoned until they release the OS to the public. Let's face it. If your machine is going to be left behind, Snow Leopard 10.6.8 is a nice stretch of the boondocks to be pastured in. Snow Leopard is Apple's Windows XP.
For my part I am sticking with Snow Leopard until it is not viable to stick with it, because Lion and forward broke compatibility in major ways and I am not going to spend thousands of dollars for software upgrades just to have the latest OS abortion from Cook and Co. Sure the OS is free... but the app upgrades are NOT.
Fuck you Adobe, MS, et al. How much arm twisting did it take to get Cook to hand you a sweet deal like this?
PS: This time there was no CPU transition to justify breaking compatibility.... 64 bit had almost no impact. So WTF was so important that breaking compatibility was acceptable? It wasn't the sand-boxing. That can be turned off on per application. It wasn't Dynamic Allocation Randomization. AFAIK that is transparent to applications. No app developer worth their salt tries to predict where the allocator will put the next Phys allocation, and it doesn't matter to the App since it's living in a Logical Address Map anyway. AFAICT the ONLY reason Lion and greater broke compatibility is to generate revenue for the big 3rd party devs.