Cover letters help hiring managers take a deeper look into your professional profile, described on your resume. In your cover letter, you can highlight your accomplishments and let the reader take a glance at your personality. Submitting a cover letter can suggest the hiring manager your level of interest in the position you are applying for. If the job description of the position you are applying for has instructions regarding the requirement of a cover letter, you would probably want to follow those instructions to be considered as a candidate. to answer your question, consider a pros and cons approach to deciding whether to spend your time on a cover letter. If the possible reward of submitting a cover letter with your resume is worth more than the risk of losing the opportunity of being considered for the position, then you should write it.