Non-US flight still allow laptop. In every airport terminal with a mix of US and non-US flights security is done at the same point. Additional rule means isolat

Non-US flight still allow laptop. In every airport terminal with a mix of US and non-US flights security is done at the same point. Additional rule means isolating those flights. Isolation is already done in big airport for similar reason (eg: EU flights vs Non-EU flights), some airport have the capability of doing security check at boarding gates (eg: Schiphol) But that's would still require between a little and a ton of problem depending on the airports. Unlike a bottle of water, you won't throw away your laptop. The in-person check-in is there to avoid the situation of being rejected at security.