[na85]

That would strain the definition of "imperceptible", wouldn't it?

My point is that aircraft break all the time. Once in a while they break in such a way that they need to return to base. This wasn't an MCAS failure.

[mypalmike]

Your wording was problematic. "In this case" strongly implied you were putting this incident in the same category.

[na85]

Perhaps my wording was careless; I can't go back and edit it now.