So all conversations/dialogue are CHA bound. Is this due to how dnd5e? To me can't Larian make their own house rule?

Wouldn't it be better that:

- CHA helps on PERSUASION
- STR helps on INTIMIDATION
- DEX helps on DECEPTION
- WIS there seems to be already WIS based options so no changes required
- INT checks on outsmart options perhaps?

That way you don't miss out dialogue options and it's not locked out to CHA exclusively.