Appreciate your input Vilas. I'm familiar with the Jetstar incident. However, did their problem stem from not verbalising the FMA, or not reading it at all? Had they read it, they'd notice MCT | GS | LOC wouldn't end well.
A Boeing will also behave unexpectedly if you don't confirm inputs via the FMA. As far as I know, only two US operators verbalise the FMA. Add that to the other CRJ, ERJ, Boeing and Douglas cockpits where nobody reads the FMA, I'm curious why Airbus still insists on this policy.
Their golden rule says to understand the FMA. I needn't say it out loud to understand it. Everything you've said about input vs output is true, but that applies to just about every AP system out there, which is why they all have some sort of FMA.