The frictive responses are unhelpful, but for the sake of courtesy an employer is entitled to a well-written introductory letter (even if only a paragraph) and

The frictive responses are unhelpful, but for the sake of courtesy an employer is entitled to a well-written introductory letter (even if only a paragraph) and an employee is entitled to a response (even if only a line). For both workers and employers who care greatly about common courtesy, the lack thereof does show the unsuitability of the other party.