…in the same room. Sales, marketing, support, administration, programmers, designers, what have you. These departments have very different needs for quiet or concentration or use of phones or open conversation. Mixing them together is peak bad open office design.
The design of the FAB in Material Design is based on the premise that users perform a certain action most of the time, and therefore it should be accorded an elevated status in the form of a persistent, high-level button. But in many apps, users are focused on consuming content just as much (if not more): in the Photos app, users want to view photos; in Gmail app, users want to read their emails; and in the Facebook app, users want to read their friends’ posts.