There are Valve developers working with Nvidia on NVK, which will be the future open-source driver, equivalent to AMD's RADV.
All of this takes time. RADV started around 2015-2016, but began to perform well around 2020.
NVK started around 2022-2023, so I think in another 2 years it should be good. The last time I checked, it achieved about 50% of the performance of the proprietary driver. It already supports things like DLSS and ray tracing. In fact, the development of NVK made the Vulkan team rework some things that will benefit the performance of both the open-source and proprietary drivers.
Nvidia is actively involved, both with documentation and dedicated developers.
www.phoronix.com
www.phoronix.com