Weapon proficiencies are an important part of D&D character race and class, they help to create a cohesive narrative around the character and breath life into their essence.
For example, the Elves naturally have proficiency in arechery due to their sharp eye and steady hand, they can be great at range. Halflings are great rogues due to their small size are naturally proficient with daggers and shortswords... etc...
I do worry that many players of BG3 may miss much of the nuance around the D&D 5e law regardless of understanding the basic rules.
