I'm not sure Errorplan can claim much of the credit for any changes AC may have introduced. It cetrtainly wasn't the only means of letting AC know that the changes they proposed (and essentially introduced, with what were in my view, only minor changes), caused a great deal of grief.
I read erroplan a good deal when it first came out but soon concluded that they were not interested in a balanced discussion of the issues. It seemed anytime someone tried to say something positive about AC, they were promptly bashed by several of the more active members of that group.
Needless to say, I haven't visited their site for some time and have no intention to. I think this site is far more informative and balanced in its approach and while I may not post a great deal, I certainly enjoy the many lively discussions that take place.