The OS makes you fewer worries and disruptions, adjust your settings so only certain people and notifications get through. When it’s important, respond directly from your lock screen.
The most noticeable improvement made in Alif is the overall look. Android’s fetching new aesthetic “Material Design” and it’s all about giving the OS a more welcoming look. It’s mostly flat colors, clever use of shadow and UI elements which look like layers of paper stacked on top of one another.