Test automation does not inherently find more defects than manual testing; it executes pre-scripted tests against the software. The effectiveness of finding defects is determined by the quality of the test cases, whether automated or manual. Automated tests run the same steps consistently every time they are executed, which means they are not designed to find new defects unless the test scripts are updated to reflect changes in the test cases or the system under test.
References = The information is synthesized from the ISTQB Test Automation Engineer syllabus and various resources that discuss the benefits and risks of test automation. Specifically, the ISTQB emphasizes the efficiency, repeatability, and coverage that test automation provides, as well as the challenges such as the initial investment and ongoing maintenance required1.
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