Yes, part of the point of studying philosophy is getting feedback from discussing ideas with others. But there's still a basic vocabulary and set of ideas everyone should learn simply so they realize their revolutionary ideas about reality and truth and beauty and so on have occurred to others, and have been discussed, probably for centuries if not millennia, and that the results of those discussions have been preserved.
It would be contentious, but some of the lists of core resources for CS are contentious, too.