Binary objects are obviously far more opaque than plain text when it comes to piping data between tools, and that is a negative thing for the reasons he just gave.
When your shell can decode these binary objects natively, they are not any more opaque than text encoded as a stream of ASCII or UTF-(8|16|32) bytes. PowerShell pipes btw work seamlessly with native executables and turn these objects into text so you can put a grep at the end of your chain of PowerShell (assuming you have gnu grep installed) to perform filtering the unix way. Powershell will turn text into an object (of type string), and the console spits out text in the end. You can redirect this text to a file.
In addition to all that, you have the ability to operate on