This is just simply not true. You're not required to have everything, having few tall units is enough for Imlerith to fail. But if you have no removals or locks in your deck then you just play pure point vomit deck, which should not be encouraged. Fewer strong point vomit decks we have, the better it is for the game.
Very few strong units can survive an I:S tutored by Royal Decree. The massive advantage offered to the attacker in a duel also makes it hard for them to survive even without Royal Decree, as they need to be stronger than 9 even in that situation.
I love how you are making assumptions as to the decks that I play not based at all on what I say. Go back and read my posts and you will find that I run at least 3 locks/removal in my current deck. 4 if you count the revive which can be used again. The fact I have to keep at least 2 in hand (if I even draw them), not because the opponent has this card, but because the opponent MIGHT have it with Renew, is what is overdoing it for me.