* Because modern server software is more sophisticated and delegates less to insanely complicated configurations; more unicorns and fairy dust, more "batteries included"
* Because things that involve complex configurations are more likely to sprout "aftermarket" utilities (like monit or god)
* Because a 5-minute "get it up and running" first user experience is now the barrier to entry for new server programs
* Because so much server software starts out pure open source and requires good documentation just to get people to use it in the first place
* Because high-end sysadmins are far more likely to be Python, Perl, or Ruby programmers now than they were in 1996