I didnt know where people were getting this info and on all of our gear, not one has a primary reg on a long hose and they are all "Factory"..
Actually, the long hose configuration is and has been common for a long time. The AirII system has also been common for a long time.
Both configurations prove effective and popular. Both configurations require the primary be donated to the OOA diver. It is not a difficult process to learn. My octo is the same S600 model as my primary. I am comfortable with the 7' primary hose configuration and can deploy it with the same efficiency as anyone who deploys their octo. It allows me to take control of the situation and get the other diver under control. Then, we can make a controlled ascent and I can remain in control without issue. Just like an octo donation, except I have a little more control due to the extra length of hose.
The information on AirII and long hose configuration is given at most AOW classes I've sat in on.
Today, all dive shops (in this area anyway) Carry hoses of varied length and the "standard" setup is what the reg purchaser requests.
So we had to ask as we are in the basic section and everyone here is talking about giving their primary but standard setups dont have the primary on a long enough hose.
In this thread, or in the basic section? I've seen the answers in this thread and agree with you. They are recommending deployment of the longer hose (primary or octo) based on your question. I haven't read these recommendations throughout the "basic" section (But, honestly, I haven't searched it out).
What started these answers appears to be in your original post where you ask "why", then go on to state "No way"... It
appears you've asked a question and then stated you weren't going to listen to the answers to your question. That may not have been your meaning, but that is what came across.
So, you either really want to know why it is taught/done, or you meant to "troll" for answers you could "bash". Is that correct? I don't know. It just
appears you are asking a question in order to "bash" the answers.
If you also believe experience doesn't make a good diver, you are correct. Knowledge does not make a good diver either. Combine the two and tweak it a little and you do have what makes a good diver...
Correct knowledge, experience and continued practice make a good diver.
Good luck