Update: 14/12/21 - This has now been fixed.
Despite Valve pushing many areas of Linux gaming, including the upcoming Steam Deck handheld which will use the Arch-based SteamOS 3, they still totally break their own games.
It's pretty concerning that their absolute #1 most popular game on Steam, Counter-Strike: Global Offensive, has been thoroughly broken on Linux (and macOS) with the update that landed on Friday, December 10. First, the game wouldn't even launch at all which was thankfully fixed - but there's a pretty huge game-breaking problem still left in.
For this, I don't really need to do much explaining, I think these pictures speak for me:
You can track the open issue for it on GitHub.
It does raise an important question - are Valve even testing updates to their own games on Linux? Something like this should not have slipped through the cracks. If it does when the Steam Deck is out, what hope is there? Valve need to do better. Also, don't deploy on a Friday, you dummies.
There's probably some better news coming though, as it appears Valve are preparing Vulkan support for CS:GO with the use of DXVK-Native just like they did for Portal 2, Left 4 Dead 2 and Half-Life 2. As we posted about recently on Twitter, a new "-vulkan" string was added and you can also see DXVK libs being added too.