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It is a developer tool, and it is Wine. It sure seems like you can just run an unmodified DX12 game from a Windows .exe on your Mac, provided you're running the latest beta OS.

Latest beta OS isn’t necessary. It works on macOS Ventura.

The latest Beta of macOS? Does it have wine built in??

Yes, but the goal is developers to use that to come up with rough estimates for performance if they did optimizations. Users aren’t meant to directly use it - it’s a launching point for developers.

Also it’s more special than Proton for Mac because Proton does DirectX to Vulkan (needing a second round for Vulkan to Metal through MoltenVK), this is DirectX to Metal.

Right. The real reason appears to be helping developers figure out “is it worth the time to try and port my game to the Mac, or am I going to go through it all and end up at five frames per second?“

You can checkout r/macgaming on reddit, people are already experimenting running windows games.