This is to be expected from an abstraction layer. WordPress hosting is really a lot of abstraction layers that facilitate communication between bloggers and co

This is to be expected from an abstraction layer. WordPress hosting is really a lot of abstraction layers that facilitate communication between bloggers and communities and it does a lot of that. One of the things wordpress hosting abstracts is server management, which Rackspace also does, though not specifically for wordpress. There are lots of processes running on the machines and if someone uploads malicious code or bad performing code, it could be detrimental to other blogs on the same machine or machines or sets of machines which may even be managed by Rackspace, who knows, and databases all working together. Systems at that scale are constantly evolving to fend off hackers from within the wordpress community and outside it. From within the network and beyond the firewall. Rackspace has their own set of problems lower in the stack than wordpress. Lower in the stack than any application specific code, be it within wordpress's open source or a JavaScript library, a custom website for a mobile phone or image processing.