737Driver, Matt48,
‘…
evidence to suggest that the electric motor could stall under the loads …’
This may depend on the direction of applied load. MCAS ‘nose down’ could be easier than a resorting ‘nose up’ crew trim switch input. Similar problems for manual trim wheel, particularly if the elevator is deflected to demand aircraft nose up.
Also see the discussions about deliberate electric trim inhibition -
https://www.satcom.guru/2019/04/what...-on-et302.html diagram of electric trim limit. Was MCAS wired through this restriction or not ?
The basic point was identified in the EASA certification query, which was answered as the alternative trim wheel input would be available