Some party tricks are load bearing.

Imagine an AI feature that is potentially creepy… but that works entirely on device.

The party trick is that you can flip on airplane mode and it still works.

This demonstrates that it really is on-device.

People will rarely do the party trick in normal use.

But the fact that you can do the party trick is load-bearing.

It's a party trick that's impossible to fake.

The whole inductive argument of "here's why you should trust this" relies on that party trick.