The tutorials I took covered what the lectures and readings already covered in more detail, with fewer students to tend to, and with a tutor who's there to answer questions, guide discussions, and do exam preparation. We only had tutorials for survey lectures, so having a dedicated class to actually discuss, say, Kant's First Critique in a bit more detail than two 90 minutes lectures allowed for was actually helpful (but hardly comparable to a seminar on it). And given that freshman students regularly have the weirdest ideas of what studying philosophy actually is like, having a dedicated time slot to practice skills like reading and analyzing isn't the worst idea either.