nasus passive needs a cap

his passive needs a cap i mean once he gets 300 he can almost one shot me while im xin with 170 armor and i have seen on average most ppl who use him get 400 to 700 stacks on his passive at lv 18 with full set he can 1 shot all champs in a team that are not tanks

so pls ffs put a cap of 300 max on his passive i mean come on its 300 additional damage on his q but this is just what i think should happen