The fact that the musicians, while extremely talented, do not play technically difficult lines for the sake of showing off or to stand out. Though the guitarists are very good, they do not mindlessly shred through songs to show their technical ability. The drummer is the same way. He does not say "look, here I am, I can play sixteenths on my double bass pedal until the cows come home." The musicians play what is needed to make a good song and to create emotion within the music. That is much more difficult than an all-out display of speed or technical ability.