[FabHK]

I think that's a pretty good analogy. If you do everything right, you'll get this malfunction under control. But it's easy to see how pilots whose plane is acting up unexpectedly can miss it, and it's reasonable to ask whether Boeing could've done better - and the regulators (note that according to the article, FAA and EASA were convinced by Boeing that this did not require re-training, while the Brazilian regulator wasn't).

[del82]

> If you do everything right, you'll get this malfunction under control. But it's easy to see how pilots whose plane is acting up unexpectedly can miss it, and it's reasonable to ask whether Boeing could've done better

Absolutely reasonable to ask what Boeing could have done better. I'm just not sure the information about Boeing's actions contained in the article gets me all the way to "indefensible", paraphrasing another comment.