@jasonmcneill @cassidoo @jlengstorf @codeFreedomRitr @kenny_io Decoupled? No.
Reduced load? I guess.
The primary benefit is in breaking the relationship between the number of requests your site gets, and the amount of "work" that your server has to do.
In 2002 Aaron Swartz framed this in his post "Bake, don't fry" http://www.aaronsw.com/weblog/000404