Stealth Champs and their kit

Isn't stealth champs are supposed to have the element of surprise on their kit when they try to do something? but why Rengar is the only one that has CAMOUFLAGE but the enemy will be notified when he uses it. Isn't that going against what the entire Stealth thing but why Rengar is the only one who has that disadvantage but some champs doesn't like Eve, Twitch, Talon, Kha'Zix,...
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