Chosing a good project and shape it to fit oneself or shape onself to fit it is a part of FYP itself. If it is a fixed-topic, fixed-supervisor project it will be a course project, not FYP.
Anyway final year students should be able to be dominate on how his/her project goes and what's he/she will achieve rather than let the supervisor tell him. Real world after he/she graduate will be full of "projects" with few "courses" no matter he/she takes academic or industrial career path. Those who can not cope with projects well have higher chances to suffer in the real life.
Thus why I agree that FYP is at least as important as CAP.