Quote Originally Posted by Fireye View Post
Except, I doubt that valve would go back and do these engine updates without a good reason. They know it's going to piss people off. They know it's going to break mods and introduce bugs. But it NEEDS to be ported to OSX, and updating the engine is how they're doing that.
Actually there is a good reason. Hardware compatibility. With new hardware games might not be able to execute or achieve the same level of efficiency so developers have to patch in engine modifications to better support changes.