This is the #1 argument for buying a Steam Machine IMO.
You can achieve a lot by specifically optimizing your game for a particular machine and Valve has such extreme market power that every game studio releasing on PC will make sure that their game looks and runs great on the Steam Machine.
This machine is more limited than I expected e.g. only 8 GB VRAM, however because of Valve's market power all game studios will see 8 GB VRAM as the new limit. Every game will now aim to look and run great with only 8GB VRAM.
As a poor gamer, I truly appreciate Valve setting such a low standard for gaming PC hardware. Game studios were certainly already looking at 16 GB VRAM + 32 GB RAM as the new standard for AAA games. That is now history.
there is patch on linux where you can mark which allocated vram is important or something and then when you do it with games they have the full 8GB the rest goes to system ram i think, this makes games on linux run like 30+ fps vs Windows on systems with only 8GB VRAM,
Not being able to run adequately (even with tuned down graphics options) on 8GB of VRAM was already going to be an issue for most PC game devs. According to Valve's last hardware survey, a quarter of players only have 8GB, and another 15-20% of players have less than that.