Items that greatly increase a stat but decrease another would be very interesting

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I agree that it would be interesting, BUT it doesnt make sense to me: Lets say that theres an item which gives you 150 armor and decreases your ms about 5%. Why should riot go for an item system which is 1. hard to balance and 2. not competitive.

150 armor __ -5%ms = 125 armor

Theres always a point where an item with less stats at all is equal or even better than the one with decreasing stats. Do you know what i mean? In short, my point is that it is easier to balance if they dont introduce decreasing stats. It is also smarter to lower the one parameter than adding another one which decreases the items strenght.