There is an important point, and its been touched on above
When someone votes your post down, if the system is designed to help us understand how we affect others, how can we know what our effect on other people is if all we have is a red number? If the user leaves no feedback as to what it is you have done to offend or upset, you can sit there guessing all day as to what you may or may not need to change about yourself.
Sitting and worrying what you have done wrong to upset others, when you may have done nothing at all, has a name. Its called 'rumination' - and people pay therapists many thousands of pounds a year to help them STOP it. A therapist will also empathically and sympathetically draw attention to any behavioural issues the person may have that makes them more prone to upsetting outcomes. In here all you have is the number and the vague sense that you have been slapped in a drive by.
If we are now discouraging people from pursuing others to find out why they voted them down, then it really is a fantasy that this system could ever do 'what it says on the tin'. You cannot learn your behavioural blindspots unless they are explicitly demonstrated to you, and even then its very hard to listen unless its done sensitively.
In terms of a psychological experiment, I cant see that its really yielding any useful data. From the point of psychotherapy and recovery, it definitely does not seem to be having useful outcomes and its hard to see how it will - though I can understand the desire to stick with a decision and see it to its end. As the site is recovery focused, then surely the measure of any system designed to promote recovery is that it accomplishes that. For those that maybe COULD benefit from greater insight, the system seems to be ignored or rationalised away - it just bumps up against their already considerable defences. Whilst I agree that behavioural and emotional awareness, as well as limit setting are important parts of therapy for personality disorders, I cant help but feel this is not the way to do it.
The closest thing I have seen to an online blind spots awareness tool is the 'nohari window', and that at least includes verbal feedback. That said, its not for the faint hearted.
Ross