Imagine gate keeping people from online content in normal duties. Lets not lie to ourselves, the normal content of FFXIV is not precisely hard, it is designed so anyone can complete it. Thats why we can actually do "wall to wall" play through otherwise it would be impossible or not as common as it is.

Should people always try to use AOE? yes. It is the end of the run if they dont? No, and I have my share of runs with players that are clueless of how to run a quick duty. You slow down the phasing and tell them in the chat that they should go AOE. Even if they dont ignore it, nobody is going to die because the duty was 10 minutes longer.