Please know I'm debating here, not attacking. My tone may come across as dry or academic, which it is, but it's so dry it may also come across as harsh or argumentative, which is not at all what I'm feeling.
First, Stan's Guide says:
The essential component is the SN. Everything else is meant to make the process easier for you and to minimise any possible symptoms and discomfort.
Second, this is the complete quote of which you shared part:
The second most important step of the method after making the SN drink and swallowing it, is for the SN to stay in your stomach. You are drinking a toxic liquid and your body defences will recognise this and may try to cleanse your body. One of the defence systems is vomiting.
I'm glad you shared the link of accounts. I, too, have spent much time reading it, listing symptoms and tallying percentages, etc., so I've really engaged with it. What I noticed is that even when folks vomited, provided they took enough SN and not too much water, enough SN had entered their systems to complete the process to ctb unless interrupted, found, or they themselves aborted the attempt and sought help.
I accept that there is no debate for you personally that AEs are essential, but I would caution every member to do their own research, scour the accounts for themselves, and come to their own conclusion. After doing my own thorough research, I would be confident to drink SN right now without an AE, so long as I took the exact right amounts of SN and water.
You said that some called an ambulance due to unbearable vomiting -- that's not a failure of the method but of personal tolerance, in which case, an AE is necessary for one who finds vomiting to be intolerable. Again, it doesn't indicate that the SN failed, but that the person who took it aborted due to discomfort, not ineffectiveness. The first quote from Stan's Guide addresses this. All meds are to minimize symptoms and discomfort, not to ensure the effectiveness of the SN itself.
Forgive me, I don't recall any accounts of people who took AEs being found with AEs all over them. I think that was a typo, as one can't not take the AEs and yet have them all over, unless they're the pills they didn't take. Also, it sounds as if the failure/s was/were due to being found and interrupted. Would you be willing to clarify?