I vehemently disagree with sentiment expressed in the article. Sure, on the surface the work done Valve does significantly improve the state of Linux gaming. But this is not Linux gaming. This is Windows gaming under Linux. We need to think about the long-term effects, about maintaining a healthy ecosystem. I cannot imagine how delegating Linux and Vulkan to be a long-term emulator of DX12 and Win is supposed to be h…
Proton is the emulation layer created by Valve.
Vulkan is a cross-platform graphics API.
Your point might still stand, but it's worth debating. Without Proton, gaming on Linux is limited to native Linux games. With it, the story changes. Someone who likes PC gaming might be willing to turn Linux into their daily driver, game on Linux (with a mix of Proton and Vulkan), and now the market starts to support developers making more native Linux games, where they otherwise might not.