Why Do Artists Suggest That They Need Formal Training in Order to Be 'Good'?

So today I was thinking of the subject of formal training, and it occurred to me - why do artists continue to suggest formal training in order to be artists? Don't give me wrong...I'm not against it but I think that it is certainly not the only path or the higher path to artistic enlightenment. I believe that in order for artists to continue growing, we must stop putting stoppers and suppressors in our path. Formal training can be a suppressor to those who do not need it in their journey.