Why Is Nasus Allowed Stupid Lifesteal All Game Long?

With the right runes and masteries at level 1 he can have 20% Life steal by late game he can have 35% Life Steal with no lifesteal items at all, how on earth is this fair or balanced at all? Say what you want about his damage but the fact that he then heals from it, so hea heals tons of good dame heal per hit and since he is soi dame tanky form building tank he will take forever to lose any heal so when you finally get him down he heals it instantly. Can we please reduce his passive lifesteal to 5/ 7.5/10 so its not stupidity out of control all game long?
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