KVM is useful for when you need to be able to control earlier stuff in the boot process too, or even simple stuff like entering the password for full-disk encry

KVM is useful for when you need to be able to control earlier stuff in the boot process too, or even simple stuff like entering the password for full-disk encryption, or choosing a boot entry in GRUB, or changing BIOS settings... Many use cases for KVM and remote KVM.