@davidchase, that's like saying "why not just use expressjs.com"
In both you have to write boilerplate which Express Happiness (which I haven't used) seems to provide.
I guess you haven't used hapi, express was nice for building simple solution but as this wrapper points out in the readme it's not great for complex situations without a lot more foundational work. When we moved to hapi we were able to make complex e-commerce system without any problems or mucking around so i was simply stating s switch to a more robust framework. Take the advice with a grain of salt :)