After recently tweaking Steam Input and the Steam Client, Valve has now upgraded the main Steam Store to show off controller support for games.
They've updated the main Controller-Friendly Game Hub, allowing you to filter specifically by controller type between Xbox and PlayStation DualShock and DualSense. Making it easier than ever to ensure you're finding games that support your main controller. Example below:
Store pages for individual games also had their controller support status expanded. Down the right-side of pages were features are listed, you'll now see bits like this to indicate what controllers they work with:
There's more too including new search filtering options for specific controller models, Steam Library updates to show controller support more clearly and new filtering for your Steam Library (including for Big Picture Mode).
Speaking about why they're now expanding all this they said there were "over 3 Billion game sessions that included a controller in the past year" and of that 60% were with an Xbox controller, 27% PlayStation and the rest a mixture of Steam Deck, Switch Pro, and hundreds of other controller models. Four years ago that controller gaming session count was only 990 million, so it's a huge increase in people gaming with controllers and back then only 19% were using PlayStation controllers so their popularity has increased a lot too.
What do you prefer to game with?