the performance element of our music video and similar videos with the same element

By having the band members in the video carrying their instruments in each shots, this adds to the bands image as it is clear they can actually play the instruments. The fact that the band have the skill to play the instruments adds to the organic look and authenticity of the video. The fact that the singer is also lip syncing throughout shows the video as being indie and having a performance element.

An example of a video that uses the same element of including instruments in the video is 

Hey Jude by The Beatles: