We have a winner (startup choosing RoR)
blog.pretheory.com
blog.pretheory.com
The upside of this is you work less & do things faster because there is a lot of functionality pre-built. Solutions become a lot simpler because you are utilising more of the framework, less custom code leaving more time to solve the real problems.
Whilst I do think that it's good to have a broad view of how things fit together, knowing what every line of code is doing says to me that you are either working on incredibly trivial code, and/or you're not using existing, well-tested libraries as much as you could be.