thats great and all but what is the point of doing HEX con / int / wis / cha ???
this kind of rules, is good for pnp roleplaying inside a fight, but does not really translate well in a video game.
I don't know , I would change the spell a little :P to make it VIABLE for bg3
You're looking at it in a glass half empty way my friend. Hex already is a viable combat spell.
Everytime your Eldritch Blast levels up and gets an extra beam, you get another proc of hex each turn. Once your EB has 4 beams, its adding up to 4d6 extra damage per turn. That's a lot of damage.
Then you get to add the effects of disadvantage, which other people have already explained the combat uses of it.
Then as icing on the cake, this already bread and butter combat spell has the ability to help you in RP situations by giving your victims a no save disadvantage to: see if you're lying, notice you pickpocketing them, or cause an actor to fumble on stage. Now if it's worth using the spell slot in these situations is up to you, but the versatility is there.