From what I've heard, trimming a large jet engine plane by hand is physically difficult, even if you manage to disable the MCAS system. Additionally, I believe

From what I've heard, trimming a large jet engine plane by hand is physically difficult, even if you manage to disable the MCAS system. Additionally, I believe the core issue is that pilots were meant to fly these plans without additional retraining, which is why MCAS was added in the first place.