I totaly disagree with it, for example take a look at this part:

When it comes to session data I'm much more willing to believe in filesystem or database clustering than J2EE clustering, the key points being maturity both in the mechanism and the tools that support it (for sysadmins). There's also some serious weight going into Linux clustering which presents another path for PHP while other alternatives like MSession or memcached (pecl::memcache) also exist

do you really think, it is really a good idea to use a shared filesystem or database to store distributed http  session and application scope variables?