I don't understand this logic. It's an MMO - what did you expect when you joined it? If the bar is set so low that it's at the bottom of the deepest trench and you still can't do it. Then maybe the game honestly isn't for you? I'm not trying to sound harsh or mean, but I literally do not understand this.
I find that if you sign up for the duty finder then you agree that you have some sort of basic knowledge and know-how to be able to do the most basic of things in this game. If you can't do that then why sign up for the duty? I couldn't do that, I'd be too embarrassed and ashamed if I was like that - I'm still like this today. I don't understand how people can be fine and actually complain when people complain about them doing below the minimum that is expected of them.
Finally, it's not 'new players' - you can't hide behind that. I've found plenty of new players who've taken to the game like fish and water. It's a difference in mindset. Some improve and strive for improvement. Some are fine being below mediocre and make no attempt to go beyond that.
Edit:
You have tooltips that tell you what to press and when you're given guides and information from the square which tell you the most basic of information on your rotation. There is a 'training' area which gives you gear and the likes that tells you the basic mechanics and the likes of the game. You can see every single attack coming your way, you know where the AoE is going to hit. You can see the cast bars. You have dummies to hit and practise your rotation. Your hotbars light up when you start a combo and direct you to what you can press next. The list goes on and on.
And you don't get to edit on how it's now about 'low story' content, you don't get to move the goal posts like that. I've barely seen any newbie die in low story content because the bar is so low. The only thing I've ever seen someone die is during titan because you can be thrown off. And this one time the dps were asleep during ifrit nails - and they weren't even new. Those that do tend to die are those who don't listen. Also who the heck is running a dps meter in low-level content?