Ever head the expression, "those who teach, can't do"? This is particularly true of anyone who describes themselves as a "life coach", "marriage counsellor", "relationship guru", etc.
the only problem with this is that you do not fully understand the problem , so have no idea how an advice you give can be a good one
as an idea , if a health problem is minor is easy to be fixed then almost any medic can treat it
if the problem is very complex , then only someone super experienced in that particular problem can fix it . And the experience is gained by real life experienced not reading a book or seeing some simple cases
that is why medics super specialize
same thing with relationship advices or whatever . You have to be extremely successful yourself in order to give relevant advices , as human interactions tend more towards chaos rather than logic