This isn’t quite true or at least doesn’t tell the whole story. This tool can do things that Wine can’t today. Namely supporting DX12 games. That support was added by Apple.
Wine generally doesn't really bother with any recent DirectX API's. However, vkd3d has been available as a means to play DirectX 12 games on Linux for a while now.
Of course Apple has split off their graphics API so they had to do the translation work for Metal themselves, but playing DX12 games on Wine isn't all that special.
Of course Apple has split off their graphics API so they had to do the translation work for Metal themselves, but playing DX12 games on Wine isn't all that special.