Well, the whole point of my post and the wishlist entry is to push for a native Linux version, so I think we're on the same team here. I try to support devs who are releasing native on Linux wherever possible. That is why I am not going to buy Divinity: Original SIn 2, because Larian have stopped supporting Linux. I also have a wishlist entry open for The Talos Principle. Croteam have already developed a Linux version, but lazily not released it on GOG. I won't be buying that game until the Linux version is released on GOG (regardless of how good it is).

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Luckily that is now no longer a real issue as there's Vulkan, which is fully supported on Windows, the successor of OpenGL and way more modern and performant (e.g. fully supporting multi-threaded rendering, which OpenGL doesn't). One could argue Apple is doing worse stuff today with only supporting Metal, but since this API is almost identical to Vulkan, there's MetalVK to add a small compatibility layer on your Vulkan engine.

Still, if a game runs perfectly fine in vanilla Wine (+ dxvk if it uses DirectX for rendering), it's good enough for me. It's really to compile & test such a big game on more than one platform, so it's not just the one-time porting costs, but ongoing expenses for additional development & QA time.

I'd more importantly want to have GOG Galaxy for Linux, as it's running poorly/crashing with Wine or Proton, but since it's based on cross-platform libraries (Qt, CEF, Poco, Python etc.), it should not be THAT hard to build a Linux release. Then add support for Proton (there's no restriction on using it outside Steam) and done.