“You don’t know what you are talking about. It is there now. But at the time of the accidents, it’s existence was, BY DESIGN, completely hidden from the pilots.”
No, it was not hidden. It even had switches, Sunshine. Hard to hide switches.
No, Boeing considered it an integral design detail beyond the pilot’s control. You really really are lost. And the Boeing CEO disagrees with you.
As for the switches, there was no switch for the MCAS system which Boeing admits the pilots were not told even existed.
You are wrong.