Earlier quoted context omitted.
Why is it so slow to add new features and technologies then? It took them, what, like 3 years? To add TRIM support for SSDs? Their first attempt at ASLR was woeful and badly broken and even that was a year after Vista got it.
They're not slow to add features. Some may arrive after a competitor, but every release of OS X sees low-level feature additions and updates. They're documented by Siracusa's mega-reviews as well as the OS X release notes. Nearly Apple's entire product line has been dependent on the flexibility of that foundation, from the PowerPC Macs to the Intel transition to the ARM squeeze, not to mention the recent ARM64 port.…
Meanwhile, you make woolly justifications of their slowness by making contradictions like this: "They're not slow to add features. Some may arrive after a competitor" Comments like these are not helpful and do not add anything to the conversation.
They're slow. The reasons why this is the case is still not entirely clear. But even OSX fans get frustrated sometimes at how slow they are to add features that other operating systems got years before. The most vocal recent one I can think of was probably the TRIM support for SSDs.