Agree with @cscs
Manjaro has done enough experiments with various methods of appealing to the masses - and every single one ended with massive complaints from the community - so it is more or less a waste of time - and is only creating support topics and opinionated discussions.
The possibility exist - using either systemd-bootsplash or plymouth - but as there is so many opinions and tastes around this - it must be an enduser decision - and setting it up is a great learning experience for those that fancy it.