If you don't want it, you can hide it

most distros have some way to just show a splash screen that hides it. I always unhide it, as I can see hints of things going wrong.

The messages are from a wide variety of kernel subsystems (and, later in the boot process, daemons) and most people aren't going to be familiar with everything. I could tell you what a lot of lines mean, but there are always new ones showing up as new software is written.

They're more-likely to be useful if something breaks and then you go examine a specific, suspicious-looking message and learn what it means. You probably won't be constantly trying to stay up on all kernel subsystems.