Currently some (if not most) devices require that the VFS is initialised to able to register their devices into /devices. However, if you interact directly and only with the Tmpfs there's nothing wrong with just creating a Devices superblock and when the time comes, mounting it onto root. You can actually do the same with logs (i.e. /logs) that way you can use the logging mechanism and view it inside the OS after it boots instead of what it is currently, where if I wanted to look at the logs on real hardware I'd have to record the screen and go through it frame by frame.
Currently some (if not most) devices require that the VFS is initialised to able to register their devices into /devices. However, if you interact directly and only with the Tmpfs there's nothing wrong with just creating a Devices superblock and when the time comes, mounting it onto root. You can actually do the same with logs (i.e. /logs) that way you can use the logging mechanism and view it inside the OS after it boots instead of what it is currently, where if I wanted to look at the logs on real hardware I'd have to record the screen and go through it frame by frame.