PoE 3.20: Hexes are now stronger against unique monsters and at least twice as strong against pinnacle bosses, but are weaker against regular monsters.
Currently, Hex Builds are at their weakest against monsters where they matter the most and at their strongest where they matter the least. This is partly because Hexes have hidden penalties which reduce their effectiveness when fighting unique monsters and pinnacle bosses (currently 33% and 66% respectively).
It’s normal for these monsters to have various hidden penalties, as noting every single one would create a lot of clutter in their mod descriptions. Players can reasonably expect these monsters to be more difficult to fight, so in general, showing the entire list of penalties is not very necessary. However, the penalty against Hexes is an outlier because it’s much more significant compared to other hidden penalties.
Because it is so substantial while also being hidden from players, it is unlikely to be compensated for during build creation and creates a notable disadvantage for Hex builds
We have removed both of these penalties so that Hexes will be consistently effective against all monsters in the game.