Let say I got a request to send an email at 1:00pm. This is ad-hoc request and the time will be varied. So if I want to set reminder alarm for this once time only, I have to add an alarm and keep it saved but never used again.
Or I can calculate remain time from now to 1:00pm, and use Quick TImer feature.
Or better, we can add quick alarm feature that can set the alarm such as Quick Timer. Or, I don't know, some better way to quickly set the alarm as I want.