Following this tutorial, I tried gyro aiming on my Dualsense controller, which has analog triggers and gyroscopic motion controls. I set gyro to act as mouse, activated by a right trigger soft pull. If you use Steam with a controller I highly recommend this; it gives you almost as much control as a mouse and keyboard! Along with a few other custom rebinds, this gives me a console-ish experience on Minecraft Java :)
Steam input is absolutely baller. I use it extensively with my Steam Controller. For FPS games, I have gyro aim activate while the right pad is touched.
I wish more Playstation games would implement this, and Microsoft would finally put gyro in their controllers as well. I find aiming in games with just sticks really uncomfortable, gyro is a literal gamechanger.
My feelings exactly, I can only hope the leaked Sebile controller does come to exist as a finished product someday. Gyro and proper haptic feedback would basically put it on par with the Dualsense sans touchpad and it'd mean all major platforms have gyro available by default.
From what I understand the leaks only mentioned an accelerometer, not a gyroscope. The capabilities without a gyroscope would then be more like a Wiimote without Wiimotion Plus and without the infrared stuff. So no precise positional adjustments, just shaking. The described use-case for it would be that the controller "knows" when it's being picked up. So not even in those leaks there were any plans to put a gyro in their controller like every other company out there.
I started using gyro on the Steam Deck recently. It is pretty good for fine tuning your aim. I have been playing Overwatch with it and while nowhere near keyboard and mouse, it's noticeably better than gamepad alone. I can still only play a select few characters with it though.