I understand that the question asker is really asking that since virtually all beam scenarios require designing for the moment condition why bother to do shear at all.
But, if you start with that premise I would ask do you know under which conditions shear forces overtake moment forces? How about when 5 forces are applied? How about 25?
As that number increases so does the difficulty of the answer. Sure, it’s likely the moment, but do you really want to find out you were wrong?
And, it’s ethically irresponsible to not determine the actual conditions.
MKDesign 