Actually, I would really prefer, to get a follow post within this forum, instead on someones private website!
If everybody would start to do so, we could close all forums, and post only initial posts, to follow them across the Internet!
Furthermore I don’t think it is save, to just click on every link to someones website, to catch whatever there might be “waiting” for you!
Regarding your “trick”:
If this works for you, stick with it!!
GTD is not a religion.
It is a method, that everybody has to adjust to his/her personal needs, to keep it working.
That said, with your trick, I would need about twice the time, to empty my inbox compared with the already by @geoffaire mentioned way to complete the setting for each item, and then go on to the next one.
Furthermore, while GTD is a very personal thing, and everybody should do it the way it works best for them, but also don’t expect everybody else jump happily onto their “tricks”, the GTD Concept, how it is teached, states pretty clear, that no item should be put “back” into the inbox.
If you pick something from the inbox to process it, put it into the next place, and NEVER back into the inbox.
The concept teached is named “Inbox Zero”, and that for good reasons.
The Inbox is, acc. the teached methodology, not a place to process items within.
You grab an item, process it, and put it where it belongs.
Your system is not working accordingly, as you process everything within your inbox at least twice!
As said, if your “trick” is working for you, stay with it.
But it seems that you are surprised that not everyone reacts “happy” about it, and that might be the reason, because it works for you, but is somewhat “outside” the teached GTD-Method, and not everybody wants to do the extra work, or could spent the extra time, needed for your “trick” to process the inbox.
So, if you have a workflow you want to share, or a trick that might be relevant to others, just share it!
But you shouldn’t be angry, if it is not working, or appreciated, for/by everybody else.