I was just using generic examples. However the way rails apps works with phusion passenger is exactly what you are explaining. I can run hundreds of apps next

I was just using generic examples. However the way rails apps works with phusion passenger is exactly what you are explaining. I can run hundreds of apps next to each other on a tiny VM. Once a app is loaded I don't have to rebuild the state on each request, if it is not needed anymore (or rather another app needs the resources more) it gets unloaded again. Setting up passenger, nginx and git for pushing is also a job of 10 minutes max. I get there is a market for PHP, I too recommend wordpress when I don't want to code something for someone. I just don't see it's 'simplicity' as argument.