Why? Because everyone else will and you'll look like a retard standing there with a dozen busted up and worn logbooks in a plastic grocery bag. When you go to the interview you need to have the logbook printed out and bound in a professional looking binder. Having your flights leg by leg in an electronic logbook will allow you to parse your time into whatever way each and every airline wants it broken down. Some will want night PIC by type while others will want ME night IFR separated from SE night IFR. Each and every airline is going to have different ways they are going to want your numbers broken down.
