It depends, on the situation, if you are playing open source games then no, at least for the most part, of playing closed source games that only works on windows then yes, I am just answering the question are we over reliant on steam. I have made open source games and here is a list of them and they run in linux: Bowling_Mega_Mix: https://github.com/Daniel-Hanrahan-Tools-and-Games/Bowling_Mega_Mix Untitled_Knight_Game: https://github.com/Daniel-Hanrahan-Tools-and-Games/Untitled_Knight_Game The_Game_Of_Trusters: https://github.com/Daniel-Hanrahan-Tools-and-Games/The_Game_Of_Trusters Quest_For_Chalice: https://github.com/Daniel-Hanrahan-Tools-and-Games/Quest_For_Chalice Bug_Invasion: https://github.com/Daniel-Hanrahan-Tools-and-Games/Bug_Invasion
I hope this helps you.