I think the problem is that the virtual hosting model doesn't work well for platforms where every site is a running app instance. Who starts the processes? How

I think the problem is that the virtual hosting model doesn't work well for platforms where every site is a running app instance. Who starts the processes? How do you restart them when the code changes (some platforms don't do this)? Who assigns port numbers? etc etc etc.. With PHP, whose execution model was kind of built with this in mind, this works out of the box very easily.