Well, deaths to Phlegethon are entertaining, though.
And Behemoth has a giant rock falling down as an indicator... (Though it'd be nice if we could actually crane the camera up enough to see it. :P)
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I've only played the Lv80 dungeons as WHM/RDM so perhaps I've just never had to dodge it, but it's never stood out to me as a particular threat and it's clearly not going to be doing the same degree of damage as a featured boss.
Smaller enemies in dungeon pulls just feel like hitting a pack of HP bars with vague shapes attached to them half the time, to be honest... Too much going on to get a good look at a lot of them and the chances of targeting any particular one to watch its attacks are slim. I certainly wouldn't like to be dodging a boss cyclops in the middle of a pack of enemies hiding its tells.
Again, if that's what you do I feel sorry for your party but most of the people when reciving negative feedback try to stop it from happening, if you keep living you can't think about what happened especially if you're a newbie while when dead there is higher chance for them to observe or even write the typical "What killed me" message in the party chat which will lead them to learning.
Some people really underestimate the value of failure and in part is something that leads the community to be the way it is skill wise, a death teaches more than 10 wins and 20 vuln ups.
The most important part of learning is the ability to adjust; take away the ability to put new knowledge into practice and new knowledge is far less likely to be retained. If we're REALLY running with the idea that Coincounter was some kind of crucial learning experience for new players, then it's a very poorly realized one.
Reality is that it's just a crap mechanic. Maybe when FATES were more popular it made a bit more sense, but as it stands right now it's just a cheesy bit of inept combat design that SE would rather not be displaying to the world. Let it disappear.
If you don't communicate with your party and you die to a mechanic you had no way of knowing, that is 100% all the time every day your fault. If you try to communicate and they ignore you and you die to a mechanic you had no way of knowing, then it's their fault.