Honest question: What is the point of all these specialized hosting sites? At least some are succeeding so I assume there is some value being delivered to some customers, but I am curious what that is. From where I sit it seems like Node.js, Rails, etc are just apps on an OS and while there may some tuning opportunities it's not like the difference between a specialized Node.js/Rails/etc optimizer is going to get ten times the performance of a general purpose skilled optimizer out of a stack. (I assume that if you're building a business on one of these stacks that we can safely assume that we're not talking the totally unoptimized case.)<p>I explain my assumptions so you can better answer my question; as I say, I am assuming there's a positive answer, I just don't know what it is.