I never learned Se Jong so I don't understand for myself what the real impact is of adding that turn, but I do recall the thread you refer to.
Using either of your examples though does it matter? As long as the new 'fork' of the pattern is performed well and with understanding on what the movements mean,.
You have highlighted the issue.
1. People do stuff without understanding what they are doing. How do i know, I ask them! That's the real impact.
2. Does it matter? Certainly, because although they may know what they are doing they have no idea what they left out.
This is like saying well, they learn 20 letters of the alphabet and seem to be doing great because tey can communicate their intent just fine phoneticaly. Yet, this dilutes the language.
Further, when I have visitors and see them doing things differently (And I am not referring to sine wave or lack thereof) I ask why they do things a certain way. (Note: I only ask this typicaly of first Dans or higher) The answers are often as follows:
A. Because the instructor said so.
B. They have no idea
C. The reason is.... and a simple demonstration shows the reason makes no sense.
I do not consider this as being done well irrespective of power, balance, speed etc.
Further, I do not presume to tell them what to think, I am telling them to think.
Now, if they followed the text, (any text) I could simply say they need to look at the book. Certainly reasoneable minds could agree that they may not like particular applications shown as examples by General Choi, but at least he has them.
Further, I agree with him that the most important training secret is knowing the purpose and application of the technique.