[mjg59]

You're still left with needing perfect placement, which isn't something that's realistic to do by hand. Physical case modifications are also going to be detected by any reasonable tooling (there's at least one vendor who can tell you which physical mold something came off on the production line via phone camera imaging, they're definitely going to spot a glued together hole in the case). So you're left with going in via existing case holes as the most realistic option, which has raised the bar by a significant amount - this is now an attack that's going to take much longer and require a higher level of skill, so the probability that it'll be carried out is reduced by a lot.

Nobody is realistically going to say that a computer plugged into the internet is unhackable. Instead the goal is to make it sufficiently difficult to hack that it's either cheaper to solve the problem a different way or target a different person. The same is true here. Nobody believes it's literally impossible to compromise an iPhone when you have physical access, but it's considered hard enough that almost any other option is preferable. We should be holding laptops to the same standard.