@LisPi Oh and also more things should use the networked filesystem layer of the kernel instead of the regular blockdevice one. Esp. the FUSE things like SSHFS or rclone.
Why? Becaus nbd devices behave way more nicely with network packet loss and delays and such.
(Or it's just that qemu handles them better as that's basically the only thing I've been heavily using that uses nbd devices instead of regular block device for its mounts)