I had to look up how this works for 5e because I didn't remember most armors having strength requirements. Now I don't know if BG3 implements this but in 5e only heavy armors have some strength requirements and even those aren't hard requirements as lacking the strength only reduces movement speed by 10ft, which really isn't the worst thing, light and medium only require their associated proficiencies to wear.
They have not implemented it, as long as you have the proficiency you can wear the armor without issue. So an 8 str character can move just as far as an 18 str character in the same armor.
