Plymouth
The graphical boot splash, and one of two reasons I left Alpine.
Plymouth puts a splash over the boot process instead of a wall of kernel messages, and gives you a graphical prompt when an encrypted disk needs unlocking.
On Debian the installer puts it on the disk and then doesn’t tell GRUB to use it, so the first boot after an install is that wall of text followed by a graceless password prompt. Adding splash to GRUB_CMDLINE_LINUX_DEFAULT and regenerating the config fixes it, and that lives on the Debian page because every machine needs it.
I could never get it working on Alpine Linux, which is one of the two reasons I moved to Debian. It matters more here than a splash screen usually would: Owl’s appliance is supposed to power on into an editor, and a page of kernel logging on the way there is the opposite of an appliance.