And we all now that these governments stop carrying about their citizens at the border. Not.

Are you claiming that China will force Apple to scan the phones of US citizens now?

Not necessarily, but I jave no reason to believe China, Saudi, Turkey, the UAE or other countries with some kind of leverage won't try. Especially with their own citizens living abroad.

I’m sure they will try, but I don’t see how this mechanism will help them.

Really? Now they are technically capable to do so. Before that, they were not. Or they were and just didn't tell anyone. Still kow idea how that mechanism might help?

Capable to do what exactly? What technical capability are you referring to? This isn’t a general purpose file scanning mechanism.