@Avi K
you asked what’s wrong with a license
cannot speak for rav shach
but can offer my own thoughts
rambam writes that to truly acquire the crown of torah , one should not take his mind of the torah towards other things
a driver license for a yeshiva bachur, is an opening to many ‘other things’ where his mind could be, and should not be
if we want to produce students adorned by the ‘crown of torah’ , that is
..
.