Has anyone read the preliminary report here? They used the electric trim 30 seconds before the crash. MCAS responded again. Airspeed was about 350 KIAS.
So, it would seem to me that if the electric trim could move the wheel, and that it can be stopped and overridden by hand power, that manual trim should have worked. 350KIAS should NOT be too fast for manual trim. Since they followed and summarily rejected the QRH and improvised, then who is at fault, or at least share fault? There was no reason to turn the electric trim switches back on, but since they did, they should have used it! If they had, they could have saved the airplane. I'll give the Lion Air guys a bit of a pass, but not much. They have a horrible reputation in the training department.
But what do I know. Six airlines in four countries on the B737 and I teach on it. Read the reports. Read them with a skeptical eye. They are surprisingly incomplete.