Indeed. Paper calendars might have worked for WWI and WWII, but that took a lot of effort and was not instantaneous. I would also like to get up in the morning and not have to actively check the calendar to see what are my daily tasks -- rather, I would passively glance at my phone (or computer) and have it tell me what are my daily tasks. It's just less overhead to worry about, and freeing some brain cycles for whatever tasks you may have ahead. It's either lazy or efficient, whatever you prefer :)