As a Mac user I too want SteamOS to succeed, because it will indirectly result in more games that are compatible with macOS via game porting tools and wine.
Honestly windows is just annoying to deal with. I don’t like the ads, and I don’t like my start menu bar being reorganized. I run it in a VM and managing my install keys is a huge pain with their login system.
Linux is awesome, it’s neat watching its developer friendliness result in snowballing market share.