You are right, that did come across condescending, I apologize. I am very skittish when it comes to misinformation spread on here, so I got too insulting.
IMO the raw-to-scaled score process is something only the AAMC will ever know the details on. The AAMC says the reason they have had to update the scales so often since 2015 is because they are collecting data to determine proper scales. That is why last year the MCAT average was about a 502, and now it is a 500, which is where they want it. The AAMC will want to change the exam questions or type of passages they use to keep these scaled scores constant, otherwise the exam becomes useless as an objective admissions tool.
I want to avoid having anyone believe that the scaled scores for the MCAT will always change, or that people taking a practice test, or even the real MCAT over and over will change these score conversions. they will not. The practice test scales have not really changed, and the AAMC's goal is to keep the scaled scores consistent, so that the average score is a 500, and the average section score is about 125.
Sorry for the tone, thanks for the conversation.