Actually in 2nd edition of DnD there were STR bows and even BG1/BG2 does require STR 18 to be able to draw a Composite Bow.
I did not know this! Good to know, but I still feel iffy about changing it. I am pretty lenient about adhering to 5e ruleset, but I also feel people should be able to port their DnD characters into BG3 without too much hassle.