Well, to be fair a lot of people using windows are laughing at microslop too. Just with a few tears mixed into it.

Convenience mostly, like a lot of aspects of security there is no one correct answer. And it is never an option between total security and none at all. It all depends on your risk vs convenience level, and it is usually a sliding scale between those two (some times other factors as well)

You can enter lockdown mode before going through customs, or disable biometrics