It seems like these sorts of defenses will be written even when Nvidia is worth $2 trillion more than Apple. Here's a reminder why people are mad:

Apple can support both. There's no reason they shouldn't, as a competitor on the open market; AMD, Nvidia and even Qualcomm are supporting both DirectX and Vulkan in software. It would not require Apple to retool their hardware (as Asahi has shown) and would not require them to depreciate Metal (as their OpenGL support shows). The only significant sacrifice Apple has to make is their unforgiving monopoly on modern GPU APIs that they have meted out against everyone's will but their own.

macOS will be depreciated on Apple's roadmap by the time developers take it seriously as a gaming platform. It's outrageous that people like me have to abandon the Mac because Apple expects me to satisfy myself with iPad games instead of the full range of experiences available on the software market. They have a monopoly, Apple is throwing a temper tantrum because they know Steam has the better experience and they can't compete any better than Microsoft does. Their best strategy is to kill the Mac and pretend the iPad is a console with computer-like features, which should outright terrify you if you own a Mac.