They're more than just a game studio these days, they're a major driving force of the entire industry. Linux gaming is totally viable today, something valve did almost singlehandedly over the last 7ish years (with big help from google, intel, and a few others). I'd say that's a pretty impressive feat.
Then you have their VR and steam deck hardware that is setting the bar for new gaming platforms. The fact that they also found time to ship a game is just icing on top IMO.
Here’s a small list of what Valve invented or developed over years:
Counter - Strike
Steam (and numerous innovations within it)
Dota 2
Portal 1 and 2
The entire VR industry as it exists today comes from Valve showing Oculus their far more advanced prototype and giving them the tech, which later led to FB acquisition
CastAR which was initially developed at valve - so far not successful but I think it has potential.
The best VR game currently available - half life Alyx
Portal 1 was definitely not invented outside of Valve - students had built a game with some similar mechanics. Portal was funded and developed at Valve afaik.
Does wine even compare to what Valve has accomplished with Proton?
Then you have their VR and steam deck hardware that is setting the bar for new gaming platforms. The fact that they also found time to ship a game is just icing on top IMO.