...if that's the case, why do professors exist in this day and age with so many books? Why don't we have a scholar system in reality if books should be enough for people to learn?

Like, if you've ever had a good teacher before, they're not JUST regurgitating info, they're connecting it to the wider context that currently surrounds you, aka your daily lived life (at least in a lot of cases, I'm sure there are many flavors of what makes a teacher better than an info regurgitator, but this is a solid one that I personally know of)

Teachers, while they may suck or not have the ability to be good for whatever reason, are not supposed to be just information spewing robots.