True. And although it's an advantage to have dream signs to trigger a RC(this method relies on the prospective memory), performing RCs without DSs is still effective. You are still providing the subconscious with materials it can use to give you a LD( materials here being RCing), since the subconscious may choose RCing you did during the day to place inside your dream. So yes, it's still effective to do RCs without DSs, but coupling it with DSs will give you both the chance that your subconscious will incorporate a RC to your dream, and the chance that a DS might pass, trigerring your prospective memory to trigger your lucidity.
Hope I helped

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