Yeah, that's my position.

If you're paranoid enough to be using GrapheneOS, why would you take it to an airport in the US of all places?

I bought a second hand iPhone for overseas trips, which my daughter promptly stole because she wanted an iPhone, but then i got her old android phone, which was LineageOS-compatible, so that became my travel phone.

- e-sims make it much more difficult to swap sim cards between devices.

- presumably border patrol wants to see his photos, social accounts, and email. A separate device with a copy of the information they want isn't a defense. Creating fresh travel-only accounts is tedious, b/c fresh accounts aren't connected to your friends or network (with whom you'd want to share your trip with).