1 person doesn't get to hold up 23 other people in Crystal Tower, same applies for other raids that are years old. You can watch the cutscene and remain invulnerable as long as you do not exit out early, and aren't missing much in later raids because the last actual pre-final boss cutscene is an unskipable transition.

Puppet's Bunker is already a long headache of a raid so I cannot blame anyone who pulls the last boss early, seeing as by that point everyone is desperate to just get out of there.