Does it bother you when people use ellipses for no apparent reason?

My professor just answered my question about what kind of spacing he wants on a paper with "I'm not bothered. Up to you..."

IS THERE SOME DEEPER MESSAGE THERE HE'S TRYING TO CONVEY? :0

Also, I still dunno what to do. The paper is supposed to be 15 pages max. 15 pages 1.5 spaced is a bit different than 15 pages double spaced...I already asked for an extension for this, so now that he won't specify I feel like it will look lazy of me if I submit a double spaced paper. Should I just do it 1.5 spaced? Am I over-thinking this? What would you do?