This is for mobile. The goal is quick access to the people you talk to often without having to search. This passes the "subway test". You're walking out of a b

This is for mobile. The goal is quick access to the people you talk to often without having to search. This passes the "subway test". You're walking out of a busy subway station and want to quickly take an action on the go - how fast can you get it done on a tiny mobile screen with so-so connectivity? On desktop, this is less of a problem when you have all the time, connectivity, and physical dexterity in the world to perform searches rapidly.