

You can see much much further than you can hear.
You can presumably walk out of earshot. You have to go VERY FAR before you’re out of camera shot for even consumer cameras.
It’d be interesting if there was a multi-modal device-to-device communication protocol, so that you needed both line of sight and be within audio range to be able to pick up the conversation.
Although just record them typing at that point so never mind.







I’m nearly certain that nobody who died in WW2 is alive today