Valve are still updating Team Fortress 2 (TF2), and a bigger technical update is currently in the works that will bring 64bit and Vulkan support to the Linux version.
I think this is only the 3rd post of this posted on this community, if there ends up being way too many I can just start locking or deleting any new posts on the topic, should be fine as I've pinned one of the posts to the community for the time being