However, doesn't the AI have the potential to tumble in an unusual
attitude?

You know, I've heard that too. And it sure seems like it could, by
design. Only thing is, I've spent a lot of time teaching unusual
attitudes - and I've never seen it happen. I think you need something
more radical to happen than what we think of as an unusual attitude -
more aerobatic.

I see little chance of that happening with dual AI's, and even less
chance that the average pilot will recover from an aerobatic attitude
partial panel after screwing up enough to get into that mess.

But hey - if you have the panel room, why not keep the electric TC too?

Michael