Beyond just ensuring that your resume looks like all the other resumes out there, templates are also generated as "one_size_fits_all" solutions. Do your career, your unique work experience, and your individual goals really fit in a one_size_fits_all format? For the vast majority of people, the answer will be no. Very few professionals have a completely linear, untarnished employment history. If there are any 'problems' in your background__such as a period of unemployment, too frequent job changes, a demotion, or any number of other challenges__a resume template will only accentuate and call attention to the negatives.
Unfortunately, the use of a resume template frequently backfires. Rather than aiding the job seeker to win the attention of employers, a template causes the opposite as the design and formatting will look exactly like the hundreds, thousands, or tens of thousands of other resumes in the job market, all based from the same template.