Seeing as I'm coding a lot for the S4 screens, I decided to check the compatibility with Big Sur. When running the S4, AppleUserHIDDrivers will shoot up to ~85% CPU usage. This causes a delay of about 5 seconds between button presses on the controller. Also, when moving the jogwheels, there's a slight delay, then they just have a mind of their own. Here is a video of the jogwheels in poltergeist mode: https://streamable.com/ezfhef Obviously the OS is still in beta, just making you aware of compatibility issues.