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If I'm not mistaken, one of the reasons Proton is necessary is DirectX (Windows native & Proton) still does a better job of handling a lot of things than OpenGL (Linux native), so while you still see the same house (the game), the graphics foundation underneath is completely different. And say what you will about Microsoft (don't even get me staaaaaaarted), but DirectX is polished. It might even be their best product.

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Industry has moved to dx12 and vulkan. With vulkan being native to win and Linux(and switch). In bigger engines you suport all of them, even opengl still. Some Indies might still use opengl due to it being simpler or for better support on the web or mobile.

With dx12 and vulkan its mostly up to what platforms do you want to support. As they do things quite similar. While you need vulkan for switch you need dx for Xbox. PS has its own API.

Tldr opengl is mostly irrelevant today for bigger titles and that's not what's blocking titles from supporting Linux.

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