I heard plymouth is outdated now anyway as we now have better methods of bootsplash. How would you get the initcpio based bootsplash themes in Endeavour? Can you just add the hook or do you need more than that?
The bootsplash is more or less to start with system bootsplash start at begin of booting. If you use grub-quiet or systemd-boot with silent boot and splash option shoWs system brootscreen some pc can change i believe. With plymouth can do animation i think