Hexes felt pretty bad in EA and still often don't
feel
like they do much, but they're deceptively good. Night Bloom summons do a ton of damage when it's upgraded, especially if you have the relevant god blessing. Pretty much every boss in the game has summons and they're usually quite strong as a result of this game's overall increased power level, so it's pretty useful against them. I beat
summit boss
for the first time out of EA using Night Bloom today, and I actually did more total damage with Night Bloom through the run than with anything else, somehow. That was probably because I had a dreadful twinblade build, but hexes moreso enhance your sheer output as opposed to being something you can build around. I'd also say they're much better against standard enemies than bosses, which is nice because I think standard enemies are a lot harder in this game than in the original Hades, while there's only one boss I find particularly difficult.
Perhaps the golden rock was inside us all along.