I have the same problem as the person above and for me at least, my phone is always on silent. I use a smart watch and only select priority notifications go to it, anything else, I’ll just see it when I next pick up my phone. A notification, even if it’s sent to my watch, I might miss, but an alarm will always make noise, vibration, basically will get my attention for sure. So for people like me and I’m guessing the commenter above, grue, who are trying to minimize the ways our devices distract us, notifications aren’t gonna cut it when I want an alarm for something important.