OP is right, that said, I've noticed that it's not always in your disadvantage.
I've noticed, for whatever reason, during Act 2, I had Karlach use Great Weapon Master, as well as Reckless Attack, and despite the percentage against some enemies claiming I had a 34% hit chance, It felt more at about the 66% mark, I did no explicit testing, but I could confidently send her in with her almost always hitting the enemy at least one of the two attacks per turn, more often both times than neither, too. - I believe this was specifically at the
bossfight
Larian's RNG is a mess, and the numbers are definitely wrong, though I'm not sure if all of it is intended to give the enemies a boost.
PS: Tactician Difficulty, Karmic Dice off.
