Honestly im not sure about this "Unreal" ... they state that they want to stick to the same mechanics but up them to 80.

Now ... why do we hate the 2.x Extreme trials ... or why are they forgotten mostly.

1. 2.x Had their EU players connect to NA which caused half a sec of delay making aoes appear late and hit you in an unfair way.
2a. Back in 2.x players did not have years of experience to pull from, for many of us we barely 50 and did attempt Garuda ex in ilv 60
2b. A lot of players simply never put in the effort to do them sync ... why would they?

Now that both of these factors are gone ... and if SE sticks to "mechanics stay the same" the fights will be incredibly easy going, if you take for sample Shiva ...

Starts with a shared buster, followed by a "walk through" frontal.
next is a few player marked aoes.
We are now already in Add phase ... which has once again
a shared buster followed by a "walk through" frontal
next is the cross and intercross shiva puddles and player marked aoe
And we are on bow ... in which everyone packs behind her and once 1 player is marked all others step to the side
At this point it repeats back to sword shared > frontal.

That is the entire fight, everything else is fluff dmg from her autos or some raidwide.

Shiva the E8 boss's list is already 3 times as long likely but still.
The difficulty of those is gonna be very very weird i feel as the fights are not mechanically challenging BUT punishing.