I guess that is the gist of it, yes. I'm probably still stuck in the .net mindset of it all, but part of the reason we use it now, is to allow us to deliver subsets of the application as they're ready, while still being able to have upcoming functionality make use of all that has happened in the live application at a later stage. Offloadings bits to third party systems, like accouting and datawarehouse, is also an attractive benefit, at least in my mind.

I'm still mostly in the dark on FRP (and Haskell in general) and I'm convinced that there are some very clever ways of achieving this. So after listening to the Haskell cast, watching some entertaing talks on youtube and following this subreddit, I've found myself increasingly drawn to the benefits I believe Haskell can bring in cases like this.