This is my story. I have had two computers, 14" and 16", in both my first contact was with the support (issue: tap-to-click). In both they asked me to take it to an authorized service to do tests that were all successfully passed. Then they escalated it to the engineering department. From the first case I never had an answer. From the second, the answer was that it was something intentional to avoid accidental clicks, which showed that it did not make sense because if it were so, it should apply to a simple click and not to the combination with the keys cmmd and shift, and it is not documented anywhere. I remember reading here that some had changed the part with the same behavior, so I assume it's a software problem.