The other guy mentioned:
they already said they were Mac only because they used Metal for rendering
And you say:
Metal is basically the only graphics API on Mac
So they’re on Mac bc they need Metal, but they picked Metal bc they’re on a Mac? It’s circular and friggin weird man
Not to mention there are cross-platform wrappers that will pick from all three depending on system - some that are very prolific among Rust devs (Zed is coded in Rust) like wgpu, for instance. They could’ve used wgpu and supported all 3 from the get-go and it would be easier than doing Metal anyway!
And so picking just Mac and/or Metal first is suspicious.
I don’t see where your problem comes from. It’s really simple: they wanted to target Mac, likely because that’s their preferred platform. So obviously they use the best fitting APIs for that purpose. Why would they develop a Linux or Windows application, if what they want is Mac? Nothing suspicious about that.