At least one pilot did notice this system and did demand simulator training and boeing did not have MCAS simulator training available, it did not exist! They in fact offered to put him in a real passenger plane with passengers for training but even the instructor they sent had no training nor experience with the system.  They hid what MCAS did, how much it could do and how it worked from the FAA, pilots and the airlines and charged extra to have the warning light/ mcas indicators in the cockpit. This is not a mistake, this is willful negligence, people need to go to jail.