elemental weaknesses dont really matter that much since you can just reinforce/slap all 4 resins and the game will automatically apply the best one for you.Like sure, through trial and error you could figure out which resistances and elements enemies are weak to, but... why?
though i do get that trial and error can be a frustrating thing at times (due to a lore thing), the game does scatter blood messages throughout the game to guide you throughout the game especially when it comes to clocktower bird and before every fog/major boss and maybe some instances when it tells you to guard against the orcs that chops your ankles.