It bothers me when new divers have the "trust the divemaster and you'll be fine" approach.
In my last two classes, I have had students tell me during the academic portion of the class that they had certified friends tell them they just had to learn the dive planning stuff for the test and could forget it after that because in the real world of diving a DM will lead them and keep them safe.
I wonder how many of my past students were told that as well but did not share than with me.