My main complaint with the Windows implementation is that it does not not play well with the lock-by-default policy of the NTFS filesystem. I deactivated the the filesystem watcher on Windows after the agent repeatedly locking files so that checkouts would fail.
You might give the new fsmonitor a try. It does not lock any files on the disk. It does have a single handle to the worktree root directory to listen for events. But even that is not exclusive. And it CWD's out of the tree during initialization, so it does not prevent you from deleting the worktree while it is running.
