Jose Valim responded to me saying its a fast, simpler, stateless and scalable solution compared to stateful solutions. For an example of stateful Java/ .Net app, I use a site that randomly logs me out, logs me out after inactivity, opening stuff in tabs are hit and miss (older ones let tabs mirror each other in background), normal UI actions has unexplainable pauses.
I can't yet prove that you don't understand what we're doing, but if I failed to communicate the end result, well, that's on me. It's a hard thing to summarize quickly, and I'm working on it all of the time.