i get his idea, all in all id say that 'the pefect server' isn't anywhere neer perfect at all,
mostly its a thing that the TS has figured quite nicely, is that running a dedicated websevers isn't 'that golden egg att all in truth, i would sooner install a more complex setupt with a central database server and a replicated backup ...
than i would have either one or 2 mail servers with there one webmail front ends installed, they'd be running email for all hosted domains.
finaly i would run multiple webservers up front you would have a load balancer, that could be a professional one or something as simple as nginx running of an atom330.
all data ofcouce should than be stored on some kind of nas or san.
see there, the perfect webhosting (? rack ?) setup