With the added mention that if a fight needs to be cheesed to be won, it's not well designed. No ifs or buts.
In theory ... yes, 100% ...
But as far as i know there is no such fight in EA right now.
The most challenging is to piss off everyone in Grymforge ... ane even that can be resolved without any unfair actions.
Its true tho that in both Githyanki and Grymforge it only takes few really well rolls on for them, or really bad rolls for you ... to get completely wrecked.
Personaly i blame that statistic for that since with theese ability scores its MUCH harder for them to make really bad roll.
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I still hope tho that both encounters were created this way purely for testing purposes ... bcs Larian needed data on how tough wnemies we can handle ...
And they will be tuned before release.
Bcs there are simply too huge gasps between combats.
BUT (and this is a big butt) !
Presuming fighting with Goblins represents Easy ...
And fighting with Githyanki or Duergars + Nere in Grymforge represents Hard (talking only about NPC power not encounter itself) ...
Then it seems perfectly fine to me.

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players have less HP but can deal more damage through class features and abilities.
Problem with Githyanki is that they have both HP and Damage.
Quite honestly tho ...
I wouldnt mind if BOSSES would get some boost, since they indeed are supposed to be exceptional individuals.
But when every single tracker is as strong as your (half or even entire ... depends on when you get there) party ... you just have to ask why on Earth have i ended in team with the one and only Githyanki weakling in the universe? :-/