The nice thing about playing electric guitar (I assume you're talking about electric) in a rock band is that that you don't have to use all of the strings all of the time, because there are other instruments carrying some of the sonic load. In fact, partial chords such as "power chords" are often preferable to full chords in order to give the other instruments their space within the mix.
Solo acoustic guitar....completely different ball game. One guitar has to cover the bottom end, the melody, and the rhythm.
So yeah, for learning electric guitar for a band situation, it's good to know a lot of partial chords...including power chords.
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