At what point will these restrictions be enforced? It's easy enough at airports with security at each gate, but what about the more common setup where security is centralised for all gates? There are two problems with the latter:
- It's impractical for security to screen passengers with different restrictions depending on each passenger's destination.
- Passengers destined for restricted and unrestricted destinations can mingle after security and pass devices between them.
Not a perfect analogy, but in China, flights to the US have a pre-boarding screening for liquids (mainly water bottles). they do it in the jetway with multiple tables and screeners set up. It's perfunctory, so moves quickly, but a similar setup would likely work.