I understand that restoring the equilibrium of the Max 8 required the trim to be reset using electric trim before disabling the circuits. The reason for this is that electric trim operates at least 10x faster than trying to trim manually. This can be seen in the cockpit video of electric trim in operation vis the speed that the manual trim wheels revolve. When electric trim is selected I believe that MCAS is operational so electric trim is overridden. Never the less, the MCAS system requires an intimate knowledge of its full implications. Boeing (or failing this, an over-arching regulatory body)should have grounded the aircraft prior to the 2nd disaster. The primary problem was that the manufacturer, short circuited normal conservative airworthiness standards for commercial reasons, ie; Introducing a very different aircraft posing as the previous marks. Re-training was not only not offered but was considered unnecessary.