So you're telling me my blood soaked savage barbarian will be less intimidating because they lack charisma? Seems like a huge oversight to class fanatsy.
I wouldnt say so.
Charisma is one of Ability Scores that have really unfortunate name ...
Since while it is perfectly corect, it gives people wrong ideas ... it should have ben named something like "personality power" or "presence" or something simmilar.
(Yes, i know that IS charisma.)
So its not exactly oversight ... the idea there is that if you wish to intimidate someone, you need to support it by your presentation.
BIG but stupid Barbarian who barely complete a sentence, can certainly make people affraid ...
And in tabletop they can, since you can use alternative stats with your Ability Checks (BTW something i was advocating for BG-3 aswell), if your DM allows it.
BUT! (And this is big butt.)
There should be important difference. This depends on how good DM you have, but being generaly affraid dont necessarily make you cooperative, if you understand what i mean.
On one side there is blood soaked savage Barbarian with foam at the mouth ... demanding that you will show him where is the gold, or he will massacre you ... you are affraid, understandably, but your fear owerwhelms you, bcs you see from his presence, that he may massacre you no matter if you comply or not.
On the other side tho, there is a little smaller, not so blood soaked Barbarian, but still big since they just are ... with sharp eyes and clearly determined to his goal ... demanding the same ... here you see that he have a goal, and if that goal dont involves your death and suffering, you MAY survive.
Or at least ... that is how i read the rules.

I believe they get advantage on intimidation rolls.
By Tabletop rules they should only get proficiency ...
In BG-3 EA, Berserker Barbarian gets "situational" (really, that is the only description you get) Advantage in almost every Intimidation roll ...
Wich is kinda dissapointing really, since it makes all other sources of Advantage feel quite meaningless.

I remember i was once creating Zariel Tiefling Barbarian, and i felt really clever since Taumaturgy gives you Advantage ... and it sounded powerfull ...
It felt like a bummer, that it had no meaning in the end, since you get it just like that. :-/