In a piece posted at Slate, writer and editor Matthew J.X. Malady, examines the writing section of the SAT. Through a series of interviews with college professors and those who prep students for the SAT, it becomes clear that the SAT has several specific limitations including the concern that the writing test ignores factual accuracy in favor of a student’s ability to “spew forth as many words as possible in as short a time as possible.” This is similar to the criticism offered by College Board president David Coleman who worries that the SAT rewards “fluent production effect” or “lying.”
Both Coleman and Malady offer similar solutions to the issue including the importance of students writing with source material. You can read the Malady piece here and watch Coleman address the question of coming changes to the SAT here.