I also don't agree with the article. Many aspects of sysadmin are far more difficult than DNS. > the most common server and client implementations rigorously f

I also don't agree with the article. Many aspects of sysadmin are far more difficult than DNS. > the most common server and client implementations rigorously follow the standard Not servers! in particular, many servers mess with the TTL (as author notes). It's not that these servers are defective; it's that the hostmaster has interfered with the configuration, presumably to reduce the load.