Agreed. I'm not sure how I figured it out when I first joined and added my dna test (I was already on gedmatch so that may have helped) but by the time I got my mother's test results I'd forgotten how I did it and I did a lot of clicking around the g2g files and help files with instructions that never mentioned the need to put in a GEDmatch # or that you can't upload raw DNA data here. Even when clicking on Ancestry in the add page opened up the box for adding gedmatch 3 I was just confused since there weren't any instructions about that. Since I'd forgotten it would have been useful if the how to instructions had mentioned...
Somehow my search strings didn't lead me to your article -- that's really helpful!
BTW I also found it tricky to figure out how to upload my mother's kit on my gedmatch account but connected to her profile--their instructions for that were hard for me to follow too.
I think the people who write instructions often know too much to realize what needs to be explained for the less informed.