Yeah, just one example. You can't call a big raise instantly, when you have nothing. You should consider bluffing or folding, and it takes time.
Calling with nothing is very risky, we could trust in an Ace high, or a King High but the chances are small for us to win actually. When confronted with a big raise I probably would just fold. It is not about being unpredictable when we go All in, but the chances are that the opponent has the nuts. Better to fold and win the money back later. If the other guy would check than it is a better position to go All in.