Following and established evidence base is not the fallacy of 'appeal to authority' ... and the funny thing is the evidence base here spans multiple disciplines.
Getting people who are unconsciously incompetent to event realise that they are incompetenent is very hard especially when they believe they are competent (dunning - kruger etc) reinforced by the possession of a basic certifcate of competence ...
Your failed point with regard to people with disabilities just further demonstrates your ignorance ofthe processes that someone with a significant disability goes through to get a provisional / reactivate their full licence ... ( assessment numerous Doctors , an further assessment by a OT ( and possibly orthotist) followed by an assessment with an ADI with additional training in conducting driving assessments for peopel with disabilities)