So the thing I find odd that no one has mentioned is the PC support. I fully understand that systems become dated yada yada etc. But the specs say Windows XP, Vista etc etc are still supported. However with Mac we are only going to give you the 2 most recent versions. So should windows not just be windows 7 and 8 then? I mean some of the arguments about the age of 10.6 are kind of funny when compared to Windows. 10.6.8 was released in August 2009. Compare that to XP released in 2001 with SP3 released in 2008 or even Vista which was released in 2007. This is purely a numbers game. There are enough people on ancient PC's that Blizz will support them but not enough on ancient Mac's. That's a legit reason for dropping support but why not just say that instead of the other BS they are giving as a reason.
The reason Windows XP is still supported by Blizzard in an active sense is because
Microsoft is still actively supporting Windows XP, as are the major graphics card companies (AMD/nVidia/Intel). Windows XP still gets fully vetted updates, and as such, Blizzard can maintain its games on that operating system far more easily than Mac OS X 10.6.8, which has seen no updates other than Java and a couple security fixes in more than two years now. There are no graphics card updates for this operating system anymore. There are no OpenGL enhancements or bugfixes in the pipe - nothing. The operating system is on life support and is being fed by the users that nurture it, but Apple does nothing to keep it going.
So because of that, 10.7.5 is the oldest OS to be supported, and that may well change after the middle of this year too, if Apple sticks to its guns about a yearly OS update cycle to go alongside their iOS line, because once 10.9 ships, 10.7.x will stop receiving updates. At that time, 10.8 becomes the new "bottom of the barrel" OS. That will have a far more reaching impact than losing even 10.6.8 because while most of the Macs in use now can be updated to 10.7, a great many cannot be updated to 10.8 without severe trickery, and that means more problems not able to be anticipated by Blizzard or any other company.
What's complicating this particular transition is the fact that not only does 10.7 not run anything with PowerPC code (PPC), meaning Diablo 2 can no longer run unless Blizzard does one final client app update to a universal binary, but 10.7 also has "features" that put off many users completely, such as lack of Save As..., the Resumes and Versions functionality, and especially the AutoSave feature, none of which are fully defeatable in 10.7 (and in some cases not defeatable at all).
10.8 fixes much of what 10.7 got wrong, but because it was made 64-bit only and many Macs that have 64-bit hardware do not have 64-bit EFI bootloaders, they cannot run 10.8 without the kinds of tricks hackintosh users use to enable their installations. I know this personally - I have 10.8 up and running fully on my Mac Pro 1,1, but I cannot update to 8 GB RAM or more because of the "trickery", which involves a modified EFI.boot file that nobody's been able to get past yet.
I don't use 10.7 because of the aforementioned "features", coupled with the problems associated with eliminating (and you can't do it fully) the mouse acceleration curve, which you can't completely achieve like you can via the Terminal in 10.6 and below. For gamers, that acceleration curve is a dealbreaker.
So I, and Blizzard especially, know very well that this transition is not easy, and is muddied in every way possible thanks to Apple's apathy toward its most loyal customers. There's just not much we can do about it unfortunately.
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