You know what's even more annoying? You can set a notification or email reminder to go off prior to a calendar appointment, but can't set an alarm to go off prior to one. I need my phone to make noise when it's time for me to get ready, not just show a notification!
Notifications have a lower level of priority than an alarm. Notification volume is set differently than alarm volume. Alarms take over the screen whereas notifications just give you a prompt at the top. As a person with ADD, it's a huge inconvenience and I need to use workarounds that are unreliable. I just want a ducking alarm when I need it without getting some stupid artificial limitation on why I can't do it.