Fourth attempt failure harsh? Don't think so.
I can't help but think that if somebody needs four attempts to pass any exam, they should seriously consider doing something else.
As is the case with the practical aspects of flying, these exams do require a certain degree of aptitude,ability and application, all of which which lie within the scope of Mr/Ms Average - providing they are prepared to do the work.
I do have sympathy for those who struggle with the exams - but not to the extent that I would want the pass standards relaxed!