[octorian]

Almost all serious games are Windows-only native apps, or at least are at launch.

Also, there's always going to be something you need to run that's a Windows-only binary. You may not need to run it frequently, and you might only stumble upon it every few years. It might be a utility to interface with a specific piece of hardware, or some program that performs a very specific and/or niche function. But there will always be something.