I wish we could get a successor to the steam controller, but with better build quality and more user-friendliness (both for using it, and for the process of sharing your custom per game mappings, and preferably a better way of having loaded mappings be visible in game so that you don't just have to memorize them) so it might catch on more.

I still love mine for certain use cases - like wanting to play shooters on a controller, or, more often, wanting to play point-and-clicks or strategy games on a controller, or setting up old games to control in a way that feels more intuitive, or the game Outer Wilds specifically - and I dread its breaking one day.

Edit: one thing I love about it is its middle-ground between mouse-like aiming and controller-like control over your movement speed.