Consumer products vs professional products. Time the user is willing to invest in learning your interface. USS Enterprise was designer for people who would learn it for several years in star fleet academy. Airbnb is designed to become more clear and obvious than booking.com in two first minutes the user sees it.

The same user that might be routinely using software like Emacs or Ableton Live or Final Cut Pro or 3ds max studio or AutoCad in his professional life.