Only around 10% of Steam gaming sessions are played with a controller

pcgamer.com:

Valve has released a bunch of interesting info in its Steam Year in Review 2021, including controller usage statistics. According to Valve, there are currently 48 million controllers «registered by Steam users,» and they're used in over 10% of all gaming sessions. I wonder how many of those are Steam controllers?

Back in February, a Steamworks update added a new controller usage stats page where developers can see a detailed breakdown of how often players are using controllers in their games, and what kinds of controllers they're using. The data includes gamepads, flight sticks, racing pedals, and even dance pads. Basically, anything that plugs into your PC and can be used to play a game (like a banana) but isn't a mouse and keyboard is counted as a controller. 

It wasn't surprising to read that, back in 2021, over 70% of fighting and sports games were played with a controller (or a fight stick), while that number falls to below 1% for RTS games. Only 7-8% of players use a controller for first-person shooters. 3rd person action/adventure games like Elden Ring saw a near 50/50 split between controller and keyboard and mouse usage. Elden Ring's mouse and keyboard support isn't the best.

It seems a lot of PC gamers prefer to stick with keyboard and mouse controls, even in games that prioritize controllers.

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Valve offered examples of how using this data could help a dev improve controller support for their games. Suppose you notice that PlayStation controller usage falls below the global average (24%); you might want to check if the correct PS button prompts are displaying in its game instead of an Xbox controller.