The full, complete set of tedium the author describes is: * Navigate through a handful of pages. * Scroll to the bottom of a menu. * Click an email confirmation link. * Wait 19 days. * Click 74 download links. That last part is pretty dumb! But it's also the only thing that seems remotely tedious, and I'm not sure where at any point he'd be confused. The author implies some sort of issue with the 19 day waiting perio…
Your data exists in different files and databases. That's why you get multiple files containing your data. And let's ignore that the zip archives contain files of different types.
If all the files were of the same type, what would you prefer, that Amazon edit these files and combine them into a single file? How could you prove that Amazon didn't edit out any files maliciously?
The typical way to verify file integrity is by checking hash sums. But here you don't have access to the original hashes (because they're internal Amazon files). Even if you had access to the hashes, we know the hashes wouldn't match because we're presupposing that the files have been modified to combine them.
If they were to combine all the files together, there would be no way for Amazon to document that nothing was changed. Which means the process isn't auditable, and people will come up with conspiracies about how big bad Amazon is sanitizing files before sending them out.