Well then.... glad you asked
Perhaps, I believe, your definition of "hardcore" is a bit narrow.
Well, let's start off with your question, shall we?
That was on DAY ONE of Brachiosaurus release. Oops, that poor little Rydia shouldn't be there. She's not meta. My bad. That's **FAR** harder than anything Dirnado has to off.
ELT FFT? Don't have a pic of that, as I stopped farming ELT ages ago in favor of rank XP. Trivially easy to achieve though, as with any mage team that can clear ELT, no one ever gets hit. Slotting her into the Blizzaga chain would be no problem at all.
Now, ADV Colloseum may hold a bit of water, but I can still see it happen. With a solid tank that can keep attacks on it and not attack the mages, as long as the damage out happens, it's viable.
--- Yes, hardcore can mean clearing the hardest content possible. BUT, it can also mean clearing content with units that are supposed to have "no business" ever clearing difficult content. Remember Valentus's Shadow of Death, anyone?
Each and every person that is a veteran of this thread defines how they are hardcore in their own way.
You may favor the mentality that only the top-most meta units are worth dusting off the bench, but not everyone else does.
If you tell me, I can't clear X with non meta units, my answer is going to be Challenge Accepted, and so will many other people. Look at all the people that are clearing ELT FFT using a completely free friend point unit on their teams.
Therefore, I would strongly disagree with your near-sighted definition of "hardcore" in this form.
