I'm a long-time user of free/open source software, and write various things for both fun and profit. I don't take myself all that seriously and I do all of my own stunts.
You can find me at these fine establishments on the web: Open Source Musings, The Monday Kickoff, Weekly Musings. and The Plain Text Project.
Authored Comments
Maybe you should consider pitching an expanded version of this comment to the editorial team as a rebuttal article. Being a comment doesn't quite do what you wrote justice. Just a thought ...
I've used PDFsam in the past, but drifted away from it. And now only the basic version is open source. PDFedit was a good Acrobat-like tool, too. But it hasn't been updated since 2010.