The album's out and The Sun has a keen slideshow of Cassidy's hair growth, from starting point (right) up to just before its final shave.
Dunno what James Hetfield thought of it, but he's the one who shaved the beast off. Metallica already has a song called "Pulling Teeth," so maybe it's time to add "Cutting Beards" to the canon.
Or how about "Seek and Destroy (These Whiskers)"? "Enter Barber"? "Wherever My Clipper Roams"? "Master of Razors"?
Okay, I'll stop.