I think for me, it creates a unified experience for the user. Instead of coding up a slew of different spots for loading animations for different parts of the a

I think for me, it creates a unified experience for the user. Instead of coding up a slew of different spots for loading animations for different parts of the app, I can now have a loader on the top to indicate progress. It creates less code bloat for me and the user knows something is loading regardless of what action they took in the site. My two cents.