It turns out a recent hire (or contractor) for Valve is Alyssa Rosenzweig, the developer who has done tremendous work on the Panfrost open-source, reverse-engineered Arm Mali graphics driver over the years. From there she went on to work at Collabora the past four years on Linux graphics. Since 2021 she’s also been doing...
Rosenzweig, known for her Panfrost and Apple M1/M2 GPU driver work is now contracted by Valve to work on graphics driver development! Sounds like great news for Valve's push for Linux gaming.