Medic
Neutral Evil
Mind, this was the same splat that introduced the elf samurai, and there hasn't been an errata for that either as far as I'm aware. So you are right, it seems the developers felt that what they put in the book functions as intended. Shenanigans involving the hexblade subclass mostly pertain to its function as a multiclass dip that makes weapon-reliant paladins (and sometimes bards) SAD.No need to errata it. It was balanced. Powerfull, but balanced.
This highlights an issue with some Ability Scores simply being better than others, I think. Intelligence is a dump for (almost) every non-wizard or artificer, and the practical benefits of Strength are relegated to heavy armor access (which is somewhat neutered as bounded accuracy guarantees that other armors end up about as good) and a few chunkier weapons.How many javelin can someone carry? Not a lot. How many eldritch blasts? Unlimited. Having charisma to both attack in melee and cast spells is really powerful. It is why a lot of cleric takes shillelagh through magic initiate Druid. Attacking with wisdom makes a whole world of difference and build.
The aforementioned elf samurai can still outpace the damage of a single-classed hexblade of the same level through Dexterity and reliably pull frontline duty with a finesse weapon and shield when the need arises.