To bridge the gap between their advice, I'd recommend the Anatomy/Embryo if you're in Semester 3 or earlier. If you're in Semester 4 you can't sacrifice the time anymore (they're arguably the lowest-yield subjects on FC), but the topics ARE useful, especially when done concurrently with stuff you're studying. I've had great success on class tests from studying the FC Anatomy. Even though your dedicated classes for Embryo/Anatomy are over, you may find that studying the relevant Anatomy/Embryo will be helpful.
In the end, make them a low priority regardless of what you do. If you've already flagged all the topics you've covered in class, done all your review Q's for the day, and still have some time leftover that you wanted to spend on FC, then go ahead.