there is a lot of evidence for this. this isn't a hypothesis, this is what's going on.
why else would Valve spend so much time and money on Proton? To eliminate the dependency on Windows. Windows is still the OS for gaming. Valve doesn't like that and they are successfully slowly changing that.
Now, if they would just build their 1st party titles for arm64 macOS. I would love to play Portal 1, Portal 2, and Half-Life 2 et al on my decked out MacBook Pro, but I can't. Why can't I? Well, MacBooks are such a slim slice of the market. Yeah well it would be slightly more of the market if I could play Team Fortress 2 on this thing.
why else would Valve spend so much time and money on Proton? To eliminate the dependency on Windows. Windows is still the OS for gaming. Valve doesn't like that and they are successfully slowly changing that.
Now, if they would just build their 1st party titles for arm64 macOS. I would love to play Portal 1, Portal 2, and Half-Life 2 et al on my decked out MacBook Pro, but I can't. Why can't I? Well, MacBooks are such a slim slice of the market. Yeah well it would be slightly more of the market if I could play Team Fortress 2 on this thing.