Demonstrably untrue based on two and a half decades of experience. At least chasing lib dependencies for 18 hours during the config/make/make install process is mostly a thing of the past.

  Most things behave the same way.

Ha ha. You jest.

  bbot@bbot:~/foo$ ls
  bar
  bbot@bbot:~/foo$ ls bar
  text.txt
  bbot@bbot:~/foo$ mv bar baz
  bbot@bbot:~/foo$ ls
  baz
  bbot@bbot:~/foo$ cp baz bar
  cp: omitting directory `baz'
  bbot@bbot:~/foo$ ls
  baz

There are hundreds of things like this. dd's hilarious syntax. The spotty usage of --help. Inconsistent behavior when you invoke a command with no arguments. The dazzling array of contradictory option flags for ls. Everything about vi. Etc etc etc.

You just proved the authors point.