Even past that, it was quite nice to hear the comms to see how calm and relaxed they were on many pulls.
Like two parts that stuck out to me was someone died as they were starting the mythic phase, they were explaining why and then someone was like "Shut up" to immediately follow it up with a "I'm sorry, I didn't mean shut up" just for someone else to jokingly cut him off to say "shut up" and they all just laughed.
And then there was a part where after they came out, when the beams split the group they called out "oh, you're on the wrong side" because someone got divided from the group by the beam, to which they responded with "I do what I want", again, jokingly.
It's just a bit of an eye opener. I haven't raided for Cutting Edge or anything but I've dabbled a good amount into mythic raiding and even in heroic raiding, you see people all too often just blow a gasket because of the silliest things, thinking that getting mad or screaming at someone will "fix" the issue. It just goes to show when you can have a more calm, relaxed situation people can perform better than stressing them out more.