Bootsplashes are ostensibly implemented to make a pretty startup experience and protect new users from scary kernel and init messages.
You're not a new user and it could be hiding errors or other important notices like failed services and broken configurations.
That's fscking annoying.
Edit /etc/default/grub and delete rhgb quiet from the GRUB_CMDLINE_LINUX variable.
Make sure your /boot partition (if applicable) is mounted read-write. Now update the active GRUB configuration file:
grub2-mkconfig -o /boot/grub2/grub.cfg