Well, theoretically this could be a step towards e2e encrypting the photos so that Apple can't see them on their servers.

This entire "secure tickets that unlock a derivative of your photos so we can review them" system would, in this interpretation, be there as a way to neuter law enforcement objections[1] to no longer being able to serve warrants for the contents of your photo library.

Now, will this actually happen? Hard to say.

[1] There was a story last year claiming that Apple wanted to turn on e2e, but the FBI got them to drop it. https://www.popularmechanics.com/technology/security/a306318...