Two reasons, mainly. First, it handles ebbs and flows in requests much more gracefully. It's cheap to throw everything on a queue, and handle it as the system

Two reasons, mainly. First, it handles ebbs and flows in requests much more gracefully. It's cheap to throw everything on a queue, and handle it as the system allows. Secondly, it's decoupled from your application. Trying to do things directly works for a while, then you do an in memory array, then your application crashes or gets updated and lost those messages.