Drivers are moving to user space too, but it's another case of something that will phase-in over two versions of the OS.

>DriverKit is a new SDK with all new frameworks based on IOKit but updated and modernized, designed for building Driver Extensions in user space outside the kernel.

You can build and test certain types of drivers in Catalina, but they won't be required until the next version of the OS ships.

>In Catalina, you can control USB, Serial, Network Interface, and Human Interface devices.

They will announce support for more kinds of user space drivers over time.

If there is not an available user space option for a particular use case, the existing kernel space option will continue to work.