We have been doing digital submissions for several years here in NZ. The biggest down side is you loose contact with the plan checkers and they become keyboard warriors, and wont talk on the phone. With lodgement I find you have to take longer to ensure that all files have actually been uploaded. With different systems for different authorities it can be confusing, but at least you don't have to make an appointment then travel to their office. So overall it seems easier and you can lodge at any time of the day or night.