> I'm asking for concrete reasons why it's not feasible. Spoiler: there are no reasons, only excuses.

It sounds like you're not asking anything at all

Just to play it out a bit, are you imagining that a pilot would be reporting a mechanical failure upon descent into busy airspace to some type of like AI voice agent, who will then orchestrate other aircraft out of the way (and not into each other) while also coaching the crippled aircraft out of the sky?

Are you imagining some vast simplification that obviates the need for such capability? Because that doesn't seem simple at all to me.